[donny31]

Kidding, but the problem I have is that when I close the computer at night it does not put the computer to sleep. The computer is either 1) 5000 degrees when I come back to it a few hours later or 2) the batery has run out and I need to plug it in to get the hard drive to boot back up. My buddy told me that I need to update my firmware, but when i tried this it said that I am UP TO DATE? any thoughts you wicked smart people?

[ScottNY]

Hi fellow Mac comunity members,

I am going to contact Apple when I get home about this issue, but here goes anyway.

I have a two week old MacBook Pro. It is the standard 15 inch 2.33 GHz model, no modifications, no hacks, nothing out of the ordinary. I transferred two normal user accounts from an old PowerBook, and all went flawlessly for the first two weeks.

Last night, I tried to wake the machine from its normal slumber by opening the lid, and nothing happened. The screen was dark and nothing i did would make it come up. Oddly enough, the volume keys worked, and I heard my Mail program ping that I had new mail.

I was forced to shut down the machine and reboot it. Since then, any time I close the lid, the display goes off, the sleep light on the latch comes on, but never pulses, and when I try to open the lid, the same thing happens. When I first open the lid, I can see the backlit keyboard slightly lit up for a fraction of a second as well. When I open it, the sleep light goes off, but the screen never wakes, and I can't even reboot by pressing the Power button and hitting the "R" key, nor can I shut down by hitting Power and then hitting enter. But the volume keys work, and when I sent mail from another computer, I heard my Mail program ping as before.

I tried doing this with my Mail program closed, with no open apps, right after the machine booted up to see if Mail was causing the sleep issue, but it did the same thing. I verified there was no disk activity with Spotlight indexing as well.

I reset the SMU and PRAM, same issue.

I tried setting the machine to sleep by using Sleep from the Apple menu and by hitting Sleep after the hitting the power button, and it won't sleep. It stays on and lets me do everything normally as if I had not just told it to go to sleep. If I choose Sleep from the Apple menu while my Mail program is open, Mail develops the spinning rainbow cursor forever, and can't be forced to quit no matter what I try. Hard reboot is the only thing that works.

I also set the machine to sleep after 5 minutes of inactivity, and after 5 minutes of letting it sit with the lid open, the display went dark and the sleep light came on but did not pulse. Basically, the same thing that happened when I had opened the lid the first time. The volume buttons worked and I could hear feedback from them but nothing else. Hard reboot again.

I left the machine on today for my wife to use and told her to leave it open at all times. I simply let the Display sleep after 5 minutes and left all other options to never sleep. When I don't try to set the machine to sleep, everything works perfectly normally.

Any takers? I know the original MacBook Pros had sleep issues that were resolved by a firmware update, but I can't find much info on these new models online. I have tried Macintouch, Apple and MaxFixIt. Please help if you can!

Scott

[donny31]

you are right on track with my happenings also. I have analized the issue a little further and it seems that when I close the screen, the computer simply doesnt go to sleep, therefore gets REALLY HOT and runs out of battery and shuts down. We need help!

[ScottNY]

I called Apple and spoke with a product specialist. Apparently, this issue is relatively new and being "investigated" by Engineering as they have had a bunch of recent reports about it. They may gather some information from you and make you wait a week or two, but at the very least, they will issue a fix, whether it's firmware-based, repair-based or a replacement. If your machine is pretty new, you may be entitled to a replacement machine (same specs).

This is only for C2D MBP 15 inch models.

Note that they had me run the Basic and Extended Hardware Test, re-do some of the troubleshooting I had already done (reset SMU, reset PRAM, etc.), and do an Archive and Install of OS X, so I had a good two hours of time spent on this, including three phone calls (they won't stay on the line for the Extended AHT or the Archive and Install), before I had a resolution that worked for me.

YMMV. Good luck.

Scott

[bigmike]

Originally Posted by ScottNY 

I called Apple and spoke with a product specialist. Apparently, this issue is relatively new and being "investigated" by Engineering as they have had a bunch of recent reports about it. They may gather some information from you and make you wait a week or two, but at the very least, they will issue a fix, whether it's firmware-based, repair-based or a replacement. If your machine is pretty new, you may be entitled to a replacement machine (same specs).

This is only for C2D MBP 15 inch models.

Note that they had me run the Basic and Extended Hardware Test, re-do some of the troubleshooting I had already done (reset SMU, reset PRAM, etc.), and do an Archive and Install of OS X, so I had a good two hours of time spent on this, including three phone calls (they won't stay on the line for the Extended AHT or the Archive and Install), before I had a resolution that worked for me.

YMMV. Good luck.

Scott

guys, I have a somewhat simiar issue with you lot. I closed the lid last night(when the battery still has 30% power)and I saw the light blinking. Then the next morning the mbp won't wake up from sleep unless I plug in. And the battery was already drained. And now I checked the "about this mac", it says "Full Charge Capacity (mAh): 2893"

Should I be worried? This already is the second battery I got from an apple specialist.

[Bouba]

same problem here, I have a mbp core duo 2ghz, fresh install, up to date, and won't fall asleep automatically. As stated here, the screen will turn off, the light will open but won't pulse. Can still hear the fan and the computer will come back into service by a simple touch of the trackpad. So, it only means that the screen has turned off. Computer never fell asleep. I had another sleep related problem which needed a visit to the applecare. My reed switch was misplaced.. so the magnet in the lid couldn't activate it properly. The macbook wouldn't fall asleep when the lid was closed.

After the replace, everything seemed fine, but it was still behaving abnormally.. I had itunes running and playing songs with the lid closed. Reseted the PMU. Seemed to have fixed that issue, but the auto-sleep is a no-go... maybe a firmware update will fix it.

[SEkker]

I have this same problem here on an original macbook pro.

When it happens, you often cannot shutdown without holding down the power key for an extended time.

Can be painful when you put your mac to sleep, into your bag, then pick it up a few hours later and you discover it suffers from imsomnia!

[Clive]

Yes, just seeing the same problem with a MacBook Pro 15" - shut the lid and the light comes on, but it doesn't pulse. If you leave it like this music/video keeps on playing, as if the lid is open, it isn't in sleep mode although the screen has gone off.

Seems like some kind of software problem, because the hardware switches seem to work (screen goees off, light come one...). On a restart it works fine again, but the problem quickly recurs.

[jdrumstik]

yeah so I just made a thread about this and then found this thread down their a ways. Will people please remember to post when a fix is released. My computer has been suffering from this for months now.

[rabbot]

standard core duo MPB 2.16GHz has same problem - sporadically won't go to sleep. It may or may not have started after a shutdown problem:
I closed the lid to the book before it finished shutting down & it didn't shut down until I re-opened & tried again.

Has anyone else done that? I'm trying to think about where the problem comes from, or if these machines are shipping out like this...

[jdrumstik]

Originally Posted by rabbot 

standard core duo MPB 2.16GHz has same problem - sporadically won't go to sleep. It may or may not have started after a shutdown problem:
I closed the lid to the book before it finished shutting down & it didn't shut down until I re-opened & tried again.

Has anyone else done that? I'm trying to think about where the problem comes from, or if these machines are shipping out like this...

Mine does this as well but I think that it is a different issue than the not going to sleep problem.

[strugatzki]

but what I hate most is when it *wakes up from sleep* instantly after putting it to sleep. it even does it when i put my MBP to sleep by command as opposed to closing the lid. resetting PMU et al. did not make the problem go away. worst of all, I can't reproduce it reliably.

should i wait for tiger and see if it gets any better or should i start the applecare nightmare straight away?

[jdrumstik]

That is another problem, because we wish our computers could wake up

Someone in the other sleep thread mentioned that it is caused by bluetooth dropping a connection (In my case a Logitek Mouse). WIsh apple would put out a fix.

[jdrumstik]

I may have found a solution, but Im still testing it.

System Preferences > Blu-tooth > Settings > uncheck "allow devices to wake this computer"

And that seems that have fixed it, because it is temporarily disabling the devices.

[jmlcanada]

I have been experiencing the exact same problems with my C2D MBP 2.16GHz.

Once in a while, the machine just won't go to sleep when I shut its lid. Or, I will return to my MBP to find it very hot to the touch and its battery completely drained.

[Simon]

Unplugging USB devices will wake your MBP just after it went to sleep. You need to unplug all USB devices before you send it to sleep.

[jackthejoker]

I had the same problme on a brand new MBP 15" 2.33. After doing some researching on line, I came up with a few solutions. One of which was to disalbe the Wake for ethernet network admin access' in Energy Saver which worked, I even reenabled it and when closing the lid, the LED is pulsating. I get uncheck and rechecking it jogged the system and now it's working. I've also found some info that may help others if the above didn't at:

http://www.macfixit.com/article.php?...60608105923335

[jmlcanada]

Originally Posted by jackthejoker 

disalbe the Wake for ethernet network admin access' in Energy Saver which worked

I have this option disabled too but the "won't go to sleep" problem came back tonight. I don't think the problem falls upon the Energy Saver preferences unfortunately.

This time I caught it before the MBP's battery completed died. I shut the lid to put the machine to sleep, and left my desk for about 45 minutes. When I returned, I heard the MBP's fan going at full-blast (they are LOUD!). I quickly opened the MBP's lid and found that the display was on, and it never went to sleep. The entire assembly was very hot, and my battery was almost fully-drained.

[Simon]

And you didn't connect or disconnect any USB devices at all?

Try putting your MBP to sleep before you close the display. Hit the power button and then hit 's' for 'Sleep'. Then close the lid. Will it now stay asleep properly?

[jmlcanada]

No USB devices were attached to my MBP when it fails to sleep. The problem occurs mainly when I am working mobile. (ie: Shutting the lid and putting the MBP into my bag, only to find an hour later that it's burning hot and its battery totally drained.)

When it refuses to sleep, neither closing the lid or going to Apple Menu -> Sleep will make it go to sleep. It's frustrating, so I just shut her off.

Hopefully this is something that Apple is working on. I am almost certain that it is a firmware problem afflicting the newest MacBooks/MacBook Pros. I spoke with an Apple technician at work, and he is familiar with the problem but currently does not have a fix.

[acadian]

Same problem on 17" MBP, here's the solution:

1) Trash the following two preferences;
* -/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
* -/Users/username/Library/Preferences/com.apple.systemuiserver.plist–(username is your name or System Administrators name)

2) Now re-set the SMC (Intel) as per these instructions - Resetting MacBook and MacBook Pro System Management Controller (SMC)

That's it, only thing that worked for me, two weeks going strong at this point..

[Simon]

jmlcanada, does your Mac not go to sleep at all or does wake up right after going to sleep?

Have you set 'Allow BT devices to wake this computer'?

[jmlcanada]

My MBP will go to sleep most of the time, but once in a while (maybe 1 in 20 times) it will refuse to go to sleep when I close the lid or go to Apple Menu -> Sleep. The worst part of this is that I don't know when this happens, and by the time I return to my laptop it is burning hot and its battery is dead.

My Mac has no problems waking up when it does go to sleep properly.

I have 'Allow BT devices to wake this computer' disabled, as well as the 'Wake on LAN' option disabled.

Originally Posted by Simon 

jmlcanada, does your Mac not go to sleep at all or does wake up right after going to sleep?

Have you set 'Allow BT devices to wake this computer'?

[markponcelet]

I wonder ... has anyone tried deactivating safe sleep and tested the results to this sleep problem? I have an identical problem with my Revision A MBP 17, but can't test it right now as the laptop is at Apple having the keyboard repaired. (Pesky Z key died on me.) Anyway, here are the instructions to deactivate safe sleep.

Good luck.

[jmlcanada]

Thanks for the tip. I've always wondered about Safe Sleep and its merits (to me, at least). I always save my work and close all my apps before putting the machine to sleep, as I am accustomed to using older PowerBook G4s and the like.

I disabled Safe Sleep using the link below... I will report my findings ASAP.

Originally Posted by markponcelet 

I wonder ... has anyone tried deactivating safe sleep and tested the results to this sleep problem? I have an identical problem with my Revision A MBP 17, but can't test it right now as the laptop is at Apple having the keyboard repaired. (Pesky Z key died on me.) Anyway, here are the instructions to deactivate safe sleep.

Good luck.

[Big Mac]

You close all your applications before going into Sleep mode? That's silly. Sleep mode is supposed to be convenient; it should not interrupt your work. If a machine freezes in sleep mode, then that's a problem to fix. Such a problem shouldn't make you treat sleep like a quick form of shutdown, especially if you're on a new machine that does not freeze in sleep. Please take my word on that.

[jmlcanada]

Update: My MBP didn't go to sleep again when I shut its lid. Disabling Safe Sleep did not help.

[acadian]

sheeesh people....

1) Trash the following two preferences;
* -/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
* -/Users/username/Library/Preferences/com.apple.systemuiserver.plist–(username is your name or System Administrators name)

2) Now re-set the SMC (Intel) as per these instructions - Resetting MacBook and MacBook Pro System Management Controller (SMC)

[flypenfly]

Tried that, doesn't seem to fix it. I'm also having shut down problems... ugh.

[markponcelet]

Exciting news, folks. I just updated to 10.4.9, and now my Rev. A MBP 17" goes to sleep immediately upon lid-close, and I cannot replecate the Insomnia Effect. I haven't run this update for very long, however, and I'm anxious to see if anyone else can confirm this for me.

It appears that 10.4.9 has caused the sleep problems.

[markponcelet]

Originally Posted by markponcelet 

It appears that 10.4.9 has caused the sleep problems.

Okay. Unfortunately, I can confirm that the Insomnia Bug is still present in 10.4.9. There's no mention in Apple's article about this bug being fixed, and I can now cause it to happen 100% of the time. Right now I have two possible culprits: The Sudden Motion Sensor, and (believe it or not) dashboard.

I can cause the computer to wake from sleep every single time by turning it over in my hands. I'm assuming this is due to the sudden motion sensor detecting movement and doing something about it. So maybe this is why everyone always notices their MBPs are hot coming out of their backpacks? That still doesn't explain why my (and others') laptop fails to sleep while sitting on a table overnight. But I can say this: the MBP was sleeping fine earlier today. The only program I've started since then was Safari ... and dashboard. There are quite a few widgets running on my dashboard (Weather, phone book, stocks, conversions, stickies, calendar, and a couple third-party items). That's a lot of possible culprits right there.

Sorry for the false hope.

[Abhorsen327]

I have a 2GHz Intel Core Duo Macbook 15", with 2gb ram. I've had, periodically, both of the problems described here. Before the last firmware update, my computer would periodically not awake from sleep (or at least the display would not awake)... I figured out a shortcut to make it do so: tap the power button, then press s, to bring up the "sleep/restart/shut down" window and select sleep. The display usually turned back on when I woke up the computer again, using the keyboard. Not a fix, but it made life more bearable.

Well, I installed the firmware update, and everything worked smoothly for a while. In the last week or so, though, I have noticed my computer not going to sleep. As a student, this can be particularly frustrating, because I usually don't have time to fiddle with my computer when I put it to sleep—I have to get to class, etc. I'll close my computer and put it in my bag, and when I bring it out later, it's burning hot and the battery is drained, and the sleep light is not pulsing.

What I have noticed is a correlation with high-memory Rosetta applications. The problem is *much* worse for me when I am running an application like Neverwinter Nights (a game), Photoshop CS2, or Illustrator CS2. Has anyone else noticed the same correlation?

In the mean time, I'm going to update to 10.4.8 today, and will try resetting the PMU, etc. I guess I got what I asked for, getting a first-generation Apple product

[mkatari]

Hello Folks,
I just bought (2 weeks ago) my first mac - the macbook pro, and after all the sleepless nights (pun intended) I am kind of disappointed.

Same symptons - doesn't sleep and when i open the lid the screen is still blank (but i know it's on)

I have updated to 10.4.9
I have deleted the two files mentioned earlier and reset my smc
I turned off my bluetooth, unchecked the "allow computer to wake", i also unpaired all bluetooths
I turned off the wake up with ethernet (although that was only for when power adapter is plugged in and i see the symptons even if I'm just using battery)
I also tried to upgrate the firmware which is suppose to take care of the sleep problem but my firmware version was greater than that firmware (Apple - Support - Downloads - MacBook Pro EFI Firmware Update 1.2)

Haven't tried the power + s to wake up the monitor.

I hope this gets fixed quickly - i see the thread has been going on since december

For the most part I have my laptop plugged in so it's not as much of an issue, but this weekend I will be at a meeting and I won't be able to close my lid !!

Will keep you all posted ...

[ValkRaider]

I have a MacBook Pro CoreDuo (original) which has the same problem. About 1/3 of the time it will simply not sleep. No matter what. I end up having to hold the power button down and hard powering off...

No USB devices connected.

This only started with 10.4.9 - it never happened in the year prior...

[chabig]

My Core Duo MacBook exhibits this same behavior.

[ValkRaider]

Originally Posted by acadian 

Same problem on 17" MBP, here's the solution:

1) Trash the following two preferences;
* -/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
* -/Users/username/Library/Preferences/com.apple.systemuiserver.plist–(username is your name or System Administrators name)

2) Now re-set the SMC (Intel) as per these instructions - Resetting MacBook and MacBook Pro System Management Controller (SMC)

That's it, only thing that worked for me, two weeks going strong at this point..

Nope. Didn't help me at all.

I have also cleared all of my cache's and repaired permissions. Still get 1 out of three times it just flat out won't sleep.

I have started just shutting down instead.

Never had any problems for the year I have had this MBP, until the 10.4.9 update.

[chabig]

Didn't work for me either. I think it has something to do with Parallels.

[ValkRaider]

Originally Posted by chabig 

Didn't work for me either. I think it has something to do with Parallels.

Hmm. That is interesting.

I have Parallels too. Although it is not running, and I even have the network "interfaces" it creates disabled.

Do you have any more details?

[chabig]

The sleep problem only seems to occur after I've launched and quit Parallels a few times. I started a thread over on the Parallels forums but nothing certain has been discovered yet.

http://forum.parallels.com/thread10394.html

Chris

[a_w]

Indeed, uninstalling Parallels fixed the sleep problem for me.

I was suffering from the problem since upgrading from the Core Duo to the Core 2 MacBook Pro last December. Normally I'm using the MBP with two 23" Cinema Displays, one at home, one in the lab, so I do not open the MBP normally. In this mode I could always go to sleep without problems. However, for meetings I had to use the MBP without attached display. At the end of the meeting I was never able to put the MBP to sleep (or to shut it down or restart it). I could only do a forced shutdown. Please note: Parallels was never active when this happened.

I tried everything to isolate the problem (including 2 fresh installs of Mac OS X), but I never waited long enough
before installing Parallels again.

After finding the Parallels thread (via this thread) two days ago, I immediately uninstalled Parallels (with its uninstaller), and since then the problem is gone for me.
So now I'll always have to remember to uninstall Parallels when going to a meeting :-)
(No, I've switched to VMWare which does not have the sleep problem).

[befuddled]

Hi,
I am posting with the same problem. My MacBook pro will not sleep if it is running on battery. When the AC adapter is plugged in, it will sleep fine. I have tried the PRAM and MRAM updates, taken out the battery and pressed the power button for two seconds and restarted everything, put a different battery in thinking it was a battery issue after speaking with the mac people on the phone, and even reinstalled Mac OSX at the suggestion of my local mac service center people who looked at the machine and it still will not sleep while running on battery.

Sometimes it will sleep for about 5 to 10 seconds, but then it sounds like the hard drive spins and, bang, I am back to a solid light rather than a pulsating one.

Anyone have any suggestions?

[chabig]

Originally Posted by a_w 

Indeed, uninstalling Parallels fixed the sleep problem for me.

Wow. That's good news. Just today I finally gave up and did an archive and install of Tiger. I didn't install Parallels. I'm going to operate without it for a few weeks to see what happens. Then I'll reinstall Parallels. If the sleep problem returns, that'll reinforce your conclusion.

Chris

[Dappi]

Hey everybody, I'm a new MacNN-user. I came across this thread when I was googling for the issue discussed here. I have a black Macbook 2 Ghz with 1 GB RAM, and running 10.4.9. I'm having the same problem. The Macbook won't go to sleep, not while closing the lid and not when choosing sleep under the apple-menu. I had Parallels installed, but uninstalled it when I read this thread. It didn't help. I also turned of "Wake from sleep" - ethernet and bluetooth.. And I resetted powermanagment, etc.. Did not work. The thread has been silent for a while, and I was curios if you guys still have the problem. Or did it in fact disappear, when you removed Parallels?

Thanks for any reply.

[markponcelet]

Hey, would someone else please try the two steps below and tell me if they fix the sleeping problems?

Today, I remembered that my installation of Parallels added two network interfaces: The Parallels Host-Guest, and the Parallels NAT (en2 and en3 on my machine, respectively). With all the people with sleep problems constantly mentioning that they also had installed Parallels, I thought that maybe the "Wake Computer on Administrator Network Access" setting might have some impact on my computer's insomnia.

I turned it off, and now my computer sleeps PERFECTLY. However, I also installed today's security update. So I suppose it could be either one of those.

What I'm hoping is that someone else with the sleep problem or the wake-from-sleep problem could try unchecking that option (in the energy saver preference pane) and try installing the newest update to double-check this for me. It sure seems to have fixed the problem!

[markponcelet]

Nevermind, folks. I was able to recreate the wake-from-sleep-while-lid-closed issue and the screen-goes-black-when-lid-opened issues by all the normal ways -- turning the laptop over, tapping it, etc. I just got lucky the first few times after my restart, is all.

[Dork.]

My wife's MacBook used to have the insomniac issue, but the fix listed earlier in this thread regarding the Power Management preferences worked like a charm.

But then the problem came back later, and on a sporadic basis. It seemed to go asleep OK, but would wake up while closed for no particular reason. We were at a loss as to why it came back until my wife realized that she watched a DVD a few days earlier, and re-activated the remote control in the System Prefs when she watched it.. Once we disabled it again in the System Preferences, the problem went away! We use our laptops most often in the room with the TV, and apparently one of the remote controls was intermittently waking up the MacBook.

This probably isn't causing everyone's problems, but at least it's something else to check....

[markponcelet]

For those wondering where to disable the remote, it's under the security preferences pane.

I've tried with that option off, and I can confirm that my MBP still wakes from sleep when it is moved around. If I had to guess, I'd still say that what's really happening is that a key is being pressed when the lid is closed. When I pick it up, I have to squeeze the lid toward the keyboard just to get a grip on it. And when my computer is sitting at home, it usually sits on the coffee table. Kicking the coffee table usually wakes up the MBP. And finally, if you close the lid with extra pressure (hold it down a little after it's closed) then the MBP will stay awake instead of sleeping. And naturally, it'll go to sleep when you open it and the magnets (or whatever) get to the right spot for the MBP to think it is being closed.

At first I thought it might be the sudden motion sensor, but since I can't wake the thing up by whacking it on the side, I'm going to have to say that's not it.

If this is encouraged by hadware design, though, I Just can't understand why the problem didn't affect me in previous versions of the software.

[Pressly]

Is your MacBook waking from sleep for no reason? If you can live without Bluetooth, try this:

Open System Preferences. See Bluetooth under hardware? Click the Settings tab (if necessary) and the Turn Bluetooth Off button. That should do it.

BUT if you do not see Bluetooth, you may need to reset your SMC. See this page for instructions:

Resetting MacBook and MacBook Pro System Management Controller (SMC)

That done, look for Bluetooth again and turn it off. Hopefully both you and your Mac can then get some sleep.

Pressly
Long in the tooth

[Misty Steele]

Thanks to all those who posted on this thread.

Have same issues with MBP 15 CD wt latest Tiger updates - will not sleep sometimes (5%) when the lid is closed and then screen won't come on when lid is reopened, even though it is clear that OS X is running underneath (keyboard works, OS makes appropriate sounds). Have also enjoyed the experience of removing a 3200 deg F laptop from a bag only to realize that it hadn't slept and went into thermal shutdown. Also had parallels installed, but uninstalled it (had to exorcise several hidden files) and use VMware now due to the vastly superior Linux support and robust ability to boot my refit Windows partition into a virtual machine.

The power button then "S" option to force sleep is a helpful workaround for me for now, but this is very un-Mac-like and should be fixed. I've also been trying to isolate the triggers for this problem but have not had much success. Anyone else find a solution or identify further causes yet?

What's really frustrating is that my G4 PB 17 worked flawlessly in this regard. I took great pride in closing and opening my laptop around PC users to watch them gawk at the effortless and robust sleep functionality. It didn't matter if I had bluetooth devices linked, external monitors plugged in or being unplugged, USB devices, it just worked and it always sorted itself out when it awoke with changed peripherals. Sigh.

[Pressly]

When I made my post of June 14th, I was only partly on the way to the solution. There does seem to be some bizarre connection between the disappearance of Bluetooth from my system, but I had not uncovered the cause of its part-time presence. Since that time, I discovered that removing the Microsoft AU (Automatic Update) Daemon from my Startup Items (System Preferences => Account) stopped my little Mac from loosing sleep over loosing Bluetooth. Now we're both sleeping better.