MacBook will only go to sleep after a reboot

... I have a Unibody-MacBook (late 2008) and since this summer, it suffers from insomnia: it will only hibernate automatically after a reboot (within the first 24h, approx.). Afterwards, it will stay awake - even over night. I uninstalled pretty much everything running in the background (TunesInstructor, SIMBL, iStat menus, ...), Virtualbox for its kexts, and nearly every plugin for Mail or Safari. Now, I have only QuickSilver and Yojimbo open apart from the "standard apps" such as Mail, Safari and iTunes. -
But all that did not fix my Problem. There is also nothing of further interest in the console logs - during night time, it will run TimeMachine backups regularily, but there is no attempt to go to hibernation.
Any ideas where to start?

solved by update to 10.6.5

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