The cold is good for sleep, because it takes less energy for your body to regulate its internal temperature through simple insulation (under a blanket, for example) than through temperature regulation in the heat. Perhaps there's a reason we say "knocked out cold" (other than to allude to death). People give the cold a bad rep. I've got a pretty low range when it comes to my temperature tolerance, a real snow miser type -- it's not uncommon for me to wear t-shirts in weather where those around me are wearing hoodies.
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