Young woman sleeping in bed with clean

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Not much is understood about why animals must sleep and which body functions are those that require sleep so much. The brain seems to require it more than any other organ and dream research is itself a fledgling field. The effects of lack of sleep on a person are well documented however. People who lack rest because of a condition such as sleep apnea can see their health degrade drastically.

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Size: 4992px × 3412px
Location: Chicago Illinois USA
Photo credit: © Custom Medical Stock Photo / Alamy / Afripics
License: Royalty Free
Model Released: Yes

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