Just updated to Snow Leopard and my screen turns on randomly

I like to sleep listening to music, so I turn on iTunes and dim the screen to turn it off for darkness.
I just updated to snow leopard 2 days ago and the last two nights when I try this my screen will randomly light back up a little, which doesnt really help me sleep.
I looked around on itunes and system prefrences to see if snow leopard had some random new deal, but I cannot find anything...
please, help me sleep!

Welcome to Apple Support Communities. We're all users here.
It's a known Snow Leopard 'quirk'.
The solution was posted on page 2 of this thread by user EmoIII (and probably in dozens of other threads, this was the first linked thread I came across containing the solution...)
https://discussions.apple.com/thread/3161667?start=30&tstart=0
Unchecking the box will cause the display to go dark (either by reducing brightness all the way manually, or as specified in the Screen Saver time-out value) and not wake up unexpectedly.

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