Won't come out of Sleep

[supanatral]

First of all I wanted to thank everyone because I've had a lot of quesions lately concerning my mac as you may have seen.

I've found that when I leave my notebooks monitor open and let it go to sleep by simply not touching anything, I can't pull my notebook out of sleep mode unless I close the monitor and open it again. Moving the mouse or hitting an endless amount of keys on the keyboard won't get it to wake up. Is that normal?