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Hear how scientists are studying the sleep-related brain activity of animals and migratory birds
electroencephalogram
Why does jet lag happen?
How biological clocks influence daily behavior
how poor sleep affects pain
Why sleep is so important
Why smartphones can disrupt sleep
adult polar bear and cub
For Students
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
Related Questions
Read Next
Irish Cobs in autumn pasture, horses
Why Do Horses Sleep Standing Up?
Persian cat is sleeping
Why Do Cats Sleep So Much?
One day old human baby sleeping in a hospital. Newborn, dreaming, infant, napping sleep. reproductive system.
9 Fun Facts About Sleep
Hand washing. Healthcare worker washing hands in hospital sink under running water. contagious diseases wash hands, handwashing hygiene, virus, human health
17 Questions About Health and Wellness Answered
Discover
A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England
Inventors and Inventions of the Industrial Revolution
Person paying with a credit card using a credit card terminal. Cashless payment, credit card reader
What Is a Cashless Society and How Does It Work?
Pluto. The Changing Faces of Pluto. Most detailed view to date of the entire surface of the dwarf planet Pluto, as constructed from multiple NASA Hubble Space Telescope photographs taken from 2002 to 2003.
10 Important Dates in Pluto History
Solar Eclipse, Eclipse, Solar Flare, Outer Space, Astronomy
What Causes Lunar and Solar Eclipses?
African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.
Timeline of the American Civil Rights Movement
Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere
Why Do Some Cicadas Appear Only Every 17 Years?
Young men throw balloons and glitter from above the mosque at the celebration Eid Al-Fitr after prayers playing with balloons outside of Al-seddeeq mosque, Al-Mansourah, Egypt. 17 July 2015.
Eid al-Fitr

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Videos

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
How biological clocks influence daily behavior
Discussion of biological clocks, including an overview of the suprachiasmatic nucleus,...
Video: Contunico © ZDF Studios GmbH, Mainz
how poor sleep affects pain
Learn how scientists identify neural glitches in the sleep-deprived brain that can...
Video: Displayed by permission of The Regents of the University of California. All rights reserved. (A Britannica Publishing Partner)
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 example of an electroencephalogram (EEG) showing typical brain waves of sleep...
Encyclopædia Britannica, Inc.
adult polar bear and cub
Adult polar bear and cub (Ursus maritimus) sleeping, Canada.
© Stockbyte/Thinkstock
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