Yeah, I could have of course iterated a bit before I posted - an intentional 'sleep' gives the same output.
No connections open from my side, most likely not to the machine either (personal file sharing was on, tho, but I can account for all legal users).
Turned off sharing and now its been ok. Will keep an eye on it. Weird.
iTunes stutters for a moment before an unwanted sleep, not before a wanted. Probably nothing.
J