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Normal sleep 

Normal sleep
Chapter:
Normal sleep
Author(s):

Dr Sue Wilson

and Prof. David J. Nutt

DOI:
10.1093/med/9780199674558.003.0001
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date: 30 March 2020

- Sleep is essential to normal brain function

- Loss of sleep can result in changes in mood, cognitive impairment, and abnormal hormone rhythms

- Most adults sleep for between 7 and 8 h a night; adults sleeping <6 h are likely to report that they do not get enough sleep and that they are more dissatisfied with life

- The sleep–wake cycle is controlled by two separate but interacting processes: the circadian process and the homeostatic or recovery process

- The typical sleep pattern consists of 4 or 5 cycles of quiet sleep, alternating with paradoxical, or rapid-eye-movement (REM) sleep

- Quiet sleep is often referred to as non-REM (NREM) and is divided further into four stages

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