MB just turned off!

I was using it in bed last night, watching some videos and it was hot; not more so than always though. All of a sudden it just turned off. I tried turning it on twice and it would start to start up and then it would go right back off. The third try, it started fine. I might have had the vent covered by the sheets. My question is this: When it overheats, does it just turn off like that? Or does this sound like something else someone has encountered for a different reason?
Kevin

Hello Kevin,
And welcome to the club
http://discussions.apple.com/thread.jspa?threadID=506023&tstart=0
Mac Mini (status: working) & Macbook (status: pending repair for random shutdowns)   Mac OS X (10.4.6)  

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