I'll venture that if you're capable of thinking through whether or not it's safe to get some rest then generally speaking you're not that far down the well.
I agree with this. If we take it as gospel that "if you're cold you can't trust your mind at all because you may be hypothermic and not thinking clearly", then you should never sleep at all in winter, since you may be hallucinating that you're in a warm, dry cabin by the fire...!
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