Put Mac to Sleep - Shutdown by itself

When I put my Mac to sleep at night, my Mac somehow shut itself down during the night, so I have to power it up again during the day. This happen more often then not. I am using an UPS. Any idea why this is happening?
Thanks,
Sherman

I'm on a 17" Powerbook and mine does the same thing. Also, even when it does not power down the clock freezes up and the darn rainbow wheel begins spining when I point the finder to the clock. Any ideas anybody?

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    Dave Hamilton provided this link, xlr8yourmac.com, to a member, which addresses failure of deep sleep with some users that updated and added new FireWire and USB cards.
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    Check the printer queue!"
    Good Luck!  DALE

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