daylight saving time
As any sleep-deprived person with a mirror knows, dark circles under the eyes are usually prominent after a bad night's sleep.
People who don't get enough sleep drink more soda and energy drinks than those who get the recommended amount of sleep per night.
The mysterious stage of sleep called dreamless sleep may actually involve several different states of consciousness, researchers say.
Model and reality-TV star Kendall Jenner recently revealed that she's afraid to go to sleep because of a condition called sleep paralysis.
Be prepared to "fall back" early Sunday morning, as people across the United States gain an hour of sleep with the end of daylight saving time.
A small shift in the oxygen levels in the air could act as a "reset" button for the biological clock, according to a new study in mice.
Some medical myths endure no matter how many times they've been disproven. Here are 25 that just won't go away.
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