Macbook didn't fall asleep and the fan was running?

I closed my macbook this afternoon and expected it to fall asleep like every other time, but after getting back this evening, I noticed the fan was running as if it was hot, it wasn't asleep, and I had to reboot using the power button in order to get back into Mac OSX. What is going on here? Does this happen on occasion? Or do I need to take it in and get it fixed? This is the first time it has happened and I've had it for about a month and a half. Thanks for your info.

No. If something would have overheated, it would have shutdown completely, and the fan wouldn't have been running.
When your OS stops communicating with the hardware, the fan kicks in to protect the computer from catastrophic damage. Same with iMacs, Power Macs, etc. By running, it actually protected the MacBook. You should be fine.
-Bmer
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