Some scientists think that temperature could be just as important as light at training the body’s circadian clocks.
Even today, anthropologist Gandhi Yetish remembers the bedtime ritual he had as a child during cold New Jersey winters. He would open his window, letting the frigid air rush in and cool his face. He’d quickly feel drowsier, though he’d wonder what his mother would say about the heating bill.
There’s emerging evidence that Yetish was onto something. From how deeply we sleep to how refreshed we feel afterwards, temperature can have a profound impact on our nightly rest. Some scientists are even going one step further, arguing that temperature may be as important as light for shaping when we sleep.
Here’s what we do and don’t know.
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