Originally Posted By: NightHiker
I agree that if you're not hypothermic to begin with, sleep isn't all that dangerous and probably more beneficial than anything.

Unfortunately, the more dangerous stages of hypothermia affect your cognitive ability and make you confused, so it's difficult to realize that you're hypothermic so it can be difficult to know whether it's OK to sleep or not. In fact, you apparently often feel hot during the final stage. Perfect for nap time.