It seems as though with every release of OS X a common and persistent problem experienced by Mac users is their machines to go to sleep automatically after a certain period of inactivity. From my current experience OS X 10.5.2 is no different in this respect to any previous release. As usual there are a number of threads on Apples discussion boards and on other Mac forums.
I have listed a few of the threads below for information. If anyone reading this has successfully fixed their sleep settings I would love to hear what snake oil and incantations you had to use to perform the miracle !
http://discussions.apple.com/thread.jspa?threadID=1394763&tstart=0 – 10.5.2 combo update – auto sleep no longer works. Interestingly the suggestions in this thread of running pmset -a fixed one of my two iMacs but not the other ! They are both running 10.5.2 and are new Intel iMacs.
http://forums.macrumors.com/showthread.php?t=378085&page= – MacRumors – Leopard will not sleep ?
http://www.lockergnome.com/osx/2006/11/03/why-does-one-mac-play-while-asleep-and-another-wont-ever-go-to-sleep/ – OS X Fanatics – Why Does One Mac Play While Asleep And Another Won’t Ever Go to Sleep?
My Mac never seems to stay asleep – I often put it to sleep before work then when I come back its awake again!
that is weird. i've had problems with my mac not shutting down like it is suppose to. screen saver works but not the auto sleep settings. when i come back it shows that it has always failed to go to sleep. there's a new forum about life and health issues that i chat there and talked to some folks about it. it has something to do with the microsoft word program on the mac, i'll have to go over there and talk more about it with them:
http://letslivelonger.blogspot.com/2009/04/sleep-...
thanks!