Screen doesn't come back after sleeping

Occassionally I find that after closing my MPB to put it to sleep the screen doesn't come back up after re-opening the laptop. The pulsing white light which tells you the machine is sleeping goes off, so it seems as if the machine has woken up.... but there's nothing on the screen. I'm forced to use the power button to shut the machine down and start up again.
Something to worry about?
(p.s. I just tested it again and noticed that when I close the lid the white light isn't pulsing, but rather stays lit)
Message was edited by: Scott F.

I just recently (within the last two days) started having this problem myself. I've only owned the Macbook for a few months (purchased it from Apple online store right before the new ones came out). I am thinking it might be due to a recent update or something.
When I close the lid, laptop sleeps but when you open it you can hear the CD tray spin up like it's trying to wake but doesn't. I've tried adjusting screen brightness via f-keys, changing the volume, etc. but seems like system is just locked up. I've been having to hold down the power button and force a reboot.

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