IMAC WONT STAY ASLEEP

It seems many people are having this problem. I put my mac into sleep via the many ways you can and a few minuets later it awakes. I have tried many things - i have closed all applications unplugged all usb and firewire devices and turned of wifi but still on its own accord it awakes. I have also tried resetting the smc but to no prevail.
any one found a solution?
this was from the most recent wake from log........any one understand this.
02/03/2010 11:38:45 com.apple.launchd[1] (com.app4mac.CheckUpAgent[11224]) Exited with exit code: 1
02/03/2010 11:38:45 com.apple.launchd[1] (com.app4mac.CheckUpAgent) Throttling respawn: Will start in 10 seconds
02/03/2010 11:54:21 SyncServer[11199] [6a209f0] |SyncServer|Warning| Refreshing watchdog because of a calendar time change alert.
something todo with calender but this is not always the case
Message was edited by: rickfordcompton1987

thanks for the help. im not sure if it worked or not but i just timed when putting my mac to sleep to when i came back - checked the log and it didnt wake for a good 2hrs. so theres a start, i also have started using this
PleaseSleep app and it seems to help, as the automatic sleep timer never works. but this app makes sure it does.
thanks

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