Macbook sleeps when cold

I have a unibody macbook that, ever since i bought it, goes to sleep when its cold. The screen goes black, and the SIL lights on (indicating sleep/standby mode), the screen will flicker once in a while, also done by pressing a random key. Until it has heated up a little, then it works again. Plugging in, or out and then in the magsafe makes it flicker or turn on permanently again. Could someone please help me. My friend's MBP unibody doesn't seem to have that problem, even when at the same temperature.

Interesting. Okay, while the battery may need replacing at some point, it seems to be okay right now. (443 cycles is a lot of cycles for a battery.) My thought was power related, due to the occasional fix of jiggling the magsafe connection.
50F (10C) is well within operating temps. (Cooler than I like in a room, but okay for the Mac.)
Lyssa--I'm wondering if there's an issue with something on the motherboard; an occasional jolt of power "reviving" the unit does not sound healthy to me. I am not sure it's an SMC issue. I'm hoping your thoughts are better than mine; I'll be interested in seeing how this pans out.
Doc

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