my computer won't go to sleep on its own. it only sleeps when i manually click sleep from the apple menu bar or if i shut the lid. i have called apple support numerous times and even taken my laptop into the apple store for help, but the problem persists. even after installing os 10.7 a week ago this is still happening. i have thought about it being application related (maybe smc fan control or gfxstatus) but i still have this problem on a test user account. is anyone else having this problem or have any idea how to properly diagnose the issue? i am sick of calling apple; they don't seem to know how to help.