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What are circadian cycles?

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Our circadian cycles -- that is, our internal "body clocks" -- determine our daily sleep cycles, performance, alertness, moods, and even our gastrointestinal functions and metabolism. Melatonin, a hormone made by the pineal gland in the base of the brain, is linked to the circadian system. Along with sunlight, melatonin helps to set the brain's biological clock. At night, melatonin is secreted, causing the body temperature to lower, and helping us sleep.

From: Common Sleep Disorders in Teens WebMD Medical Reference

SOURCES: 

Carskadon M, Rechtshaffen A. in WB Saunders, 1989.  Principles and Practice of Sleep Medicine.

Lewy A, Wehr T, Goodwin F, et al, 1980.  Science,

Walters A, Hickey K, Maltzman J, et al. 1996;  Neurology

National Sleep Foundation.

Hysing, M. , Feb. 2, 2015. BMJ Open

 

Reviewed by Smitha Bhandari on June 11, 2019

SOURCES: 

Carskadon M, Rechtshaffen A. in WB Saunders, 1989.  Principles and Practice of Sleep Medicine.

Lewy A, Wehr T, Goodwin F, et al, 1980.  Science,

Walters A, Hickey K, Maltzman J, et al. 1996;  Neurology

National Sleep Foundation.

Hysing, M. , Feb. 2, 2015. BMJ Open

 

Reviewed by Smitha Bhandari on June 11, 2019

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How can snoring and obstructive sleep apnea cause sleep problem?

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