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An unusual condition called sleep paralysis has been frightening people for centuries, and different cultures have different ways to explain the frightening phenomenon.
People who think they can get by on very little sleep may be more tired than they realize, a new study finds.
Sleepwalkers aren’t soulless, they’re just unconscious. If you do happen upon someone experiencing somnambulism, what should you do?
People who don't get enough sleep for several days in a row can't rely on caffeine to give them a mental boost, new research finds.
For some animals, hunkering down in a cozy den when nights are long and temperatures are low is not just a matter of temporary comfort — it's necessary for survival.
There are five key habits that researchers have definitively linked with better health and a longer life. But few people are doing them.
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