Mac pro shuts off when I try to wake from sleep

Hello mac gurus.
I've a problem that is slowly getting more and more frequent.
Mac Pro 2 x 2.8 GHz Quad-Core Intel Xeon
OSX 10.5.6
4 gig ram
When I leave work I let the computer go to sleep automatically. (I think I have it set for one hour of inactivity).
In the morning when I arrive at work, the LED power button is pulsing like it should. But... When I hit the space bar to wake the computer, I hear a clicking noise (from inside the computer), and the power button goes dark (ie: it shuts down completely). I then have to push the power button to restart and login as usual and all is fine.
This doesn't happen every time. But lately it seems to happen about 2-3 times a week.
I tried searching the message boards, but nothing seemed to describe my issue exactly. I'm suspecting an SMC reset might help, but again, that doesn't seem to be what's happening.
Thoughts? Help?
Thanks!
Cyen

Thanks Dale,
No I had not tried it, because I was unsure if the SMC reset was my problem or not. Since your post, I just did the reset this morning. I'll see if this fixed the problem, and I'll post an update in a few days (with hopefully positive results).
Note: I was expecting some sort of acknowledgment from the computer that the reset was successful, and there was none. So I hope I did it right.
(For those wondering, the SMC reset is simple. Shut down your computer. Unplug the power cord. Press and hold the power button for 5 seconds. Plug it back in, and restart.)

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