No i noticed the same thing a few nights ago... left it in the cradle and turned the screen off and i would wake up to it being on a few times at night. But its not every night. Last night i turned it off and woke up to it off..... very strange...
Is it possible your Wifi or 3g signal is dropping and and reestablishing itself before you wake up? Are any Bluetooth devices trying to connect? Any of these *could* cause the phone to drop out of sleep.
I think my Droid does this and after reading the post here I think I know why. I'm rooted and have auto memory, which isn't really a task killer it's suppose to help Droid manage it's memory better. I wonder if in this process of helping Droid it isn't causing my phone to wake up.
I saw it this way this morning when I got up and was a bit puzzled about it. Didn't think about it again until I read this thread.
I think I'm going to dump Auto Memory. I don't see it as being helpful anyway.
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