Sudden motion and sleep problem?

Greetings, all.
I bought a Macbook a few weeks ago. Sometimes, while I am in middle of typing a document or some other way using the computer, it will suddenly go to sleep. Hitting keys does not usually wake it up. Most of the time I have to close the lid, let it sit for a minute or two, open the lid again, and that usually brings it back. I sent it in to Apple, and, naturally, they couldn't recreate the problem.
I have tried to isolate the conditions under which this problem usually occurs, but I couldn't see any pattern. Until it occurred to me that every time I remember it happening, I was using it on my lap, which means it was constantly moving around, if only a slightly. In fact, sometimes it happens just as I move it to change sitting position.
My question is, could this in some way be related to the sudden motion dectector? If so, is there something I can do about it?
To the best of my recollection this problem has never happened while resting on a completely stable surface, like a table top. Just to test it out, I have only been using it on level surfaces the past couple of days, and it hasn't happened once. This might also explain why Apple couldn't recreate the problem in the week they had it. I assume they weren't testing it on their laps.
Any thoughts?
Thanks in advance for any help.
DPL
Macbook Core 2 Duo   Mac OS X (10.4.8)  

Try restting the Power Management Unit (PMU). This is probably a small button inside the computer. Or, try Zapping PRAM (optapple+RP on startup, and listen for 3 "bongs" before releasing the keys).

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