Tazama chanzo cha Usingizi

[[Picha:Sleeping man in Ouagadougou.jpg|thumb|Mtu akiwa amelala usingizi huko [[Ouagadougou]], [[Burkina Faso]].]]
'''Usingizi''' (kwa [[Kiingereza]] "sleep") ni hali ya [[binadamu]] na [[wanyama]] kupumzika kwa [[mwili]] na [[akili]]. 

Usingizi hutokea wakati [[mapigo]] ya [[moyo]] na [[upumuaji]] hupungua kwa [[ngazi]] zao za chini. [[Misuli]] yako inatulia na inaweza kuwa vigumu kukuamsha. Huwa hujitambui wala hujitawali sawasawa.

==Tanbihi==
{{reflist|30em}}

=== Vyanzo ===
* {{cite journal |ref=Brown|author1=Brown Ritchie E. |author2=Basheer Radhika |author3=McKenna James T. |author4=Strecker Robert E. |author5=McCarley Robert W. | year = 2012 | title = Control of Sleep and Wakefulness | url =https://archive.org/details/sim_physiological-reviews_2012-07_92_3/page/1087| journal = Physiological Reviews | volume = 92 | issue = 3| pages = 1087–1187 | doi=10.1152/physrev.00032.2011 | pmid=22811426 | pmc=3621793}}
* Parmeggiani, Pier Luigi, & Ricardo A. Velluti, eds. (2005). ''The Physiologic Nature of Sleep''. London: Imperial College Press. {{ISBN|1-86094-557-0}}.
* Parmeggiani, Pier Luigi (2011). ''Systemic Homeostasis and Poikilostasis in Sleep: Is REM Sleep a Physiological Paradox?'' London: Imperial College Press. {{ISBN|978-1-94916-572-2}}
* Turek, Fred W. & Phyllis C. Zee, eds. (1999). ''Regulation of Sleep and Circadian Rhythms.'' New York: Marcel Dekker, Inc. {{ISBN|0-8247-0231-X}}

==Viungo vya nje==
{{Commons category|Sleeping|Sleep}}
* [https://www.nytimes.com/2012/09/23/opinion/sunday/rethinking-sleep.html?pagewanted=1&_r=0&ref=general&src=me Rethinking Sleep], David K. Randall, ''New York Times,'' September 2012
*[https://www.theatlantic.com/magazine/archive/2017/01/how-to-sleep/508781/ How to Sleep], James Hamblin, ''The Atlantic,'' January 2017

{{mbegu-biolojia}}

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