Display keeps going to sleep?

The last few days the display (maybe the whole computer?) has been randomly turning off on me and the light on the open button turns on, as if my computer is sleeping or closed. Sometimes it takes a few taps on the spacebar to turn back on and sometimes it takes me closing the computer and waiting. If i do have to close it, the computer seems to recognize that it's closed because the light on the open button gets brighter. I have messed around with the power settings and turned the settings so that nothing ever goes to sleep, but this seems to do nothing. Sometimes this happens over and over again, and other times it will only happen every few hours. Anyone have any ideas what could be going on? This is driving me nuts.
Thanks

I am having the very same problem. It began this week.
Now every so often my Powerbook randomly goes into sleep mode, when I click on the mouse she wakes up.
I am at a loss as to why this is happening, but found this thread
http://discussions.apple.com/thread.jspa?messageID=5006452
Looks to me like a fiasco and a nightmare.
I'm thinking it could be the main battery inside the computer causing problems with the temp readings and causing a safety feature to kick in, but that's a guess and I do not know know what to do to fix it yet.
I'll get back if I can figure it out.

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