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If you're struggling with sleep, it's important to understand whether the issue is falling asleep, staying asleep, or not getting restorative sleep. There are different approaches depending on what your body actually Heat and Cold Illness in Travelers CDC Yellow Book Deliberate cold exposure for focus : A Brilliant Mind Human Deaths from Hot and Cold The Breakthrough Institute Full article: Human vulnerability and variability in the cold: Establishing individual risks for cold weather injuries Here's what happens to your body in subzero temperatures The Boston Globe
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