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Hear how scientists are studying the sleep-related brain activity of animals and migratory birds
A diagram of EEG tracings displays brain wave patterns for wakefulness and three sleep stages, highlighting features like theta waves, sleep spindles, K-complexes, and slow waves.
Why does jet lag happen?
Image thumbnail shows a illustration of a shark resting its head on a pillow.
A man sleeps with his mouth open on a bed, while a large spider sits on the pillow near his hand.
How biological clocks influence daily behavior
Why sleep is so important
Why smartphones can disrupt sleep
adult polar bear and cub
At a Glance
adult polar bear and cub
sleep summary
Quizzes
greylag. Flock of Greylag geese during their winter migration at Bosque del Apache National Refugee, New Mexico. greylag goose (Anser anser)
Biology Bonanza
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Hear how scientists are studying the sleep-related brain activity of animals and migratory birds
Find out how scientists are studying the sleep activity of migratory birds.
Video: © World Science Festival (A Britannica Publishing Partner)
Why does jet lag happen?
Learn about jet lag.
Video: Contunico © ZDF Studios GmbH, Mainz
Do Sharks Sleep?
It's a common misconception that no sharks ever sleep.
Video: Encyclopædia Britannica, Inc.
Do We Really Swallow Spiders in Our Sleep?
This myth is based on a web of lies.
Video: Encyclopædia Britannica, Inc.
How biological clocks influence daily behavior
Discussion of biological clocks, including an overview of the suprachiasmatic nucleus,...
Video: Contunico © ZDF Studios GmbH, Mainz
Why sleep is so important
Learn about sleep apnea and its health effects through a study conducted at the Leipzig's...
Video: Contunico © ZDF Studios GmbH, Mainz
Why smartphones can disrupt sleep
Learn why smartphones keep people awake.
Video: © American Chemical Society (A Britannica Publishing Partner)

Images

Electroencephalogram
An electroencephalogram (EEG) showing typical brain waves of sleep and wakefulness.
Encyclopædia Britannica, Inc.
adult polar bear and cub
Adult polar bear and cub (Ursus maritimus) sleeping, Canada.
© Stockbyte/Thinkstock
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