sleep

sleep
n.
a state of natural unconsciousness, during which the brain's activity is not apparent (apart from the continued maintenance of basic bodily functions, such as breathing) but can be detected by means of an electroencephalogram (EEG). Different stages of sleep are recognized by different EEG wave patterns. Drowsiness is marked by short irregular waves; as sleep deepens the waves become slower, larger, and more irregular. This slow-wave sleep is periodically interrupted by episodes of paradoxical, or REM (rapid-eye-movement), sleep, when the EEG pattern is similar to that of an awake and alert person. Dreaming occurs during REM sleep. The two states of sleep alternate in cycles of from 30 to 90 minutes, REM sleep constituting about a quarter of the total sleeping time.

The new mediacal dictionary. 2014.

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  • sleep — [slēp] n. [ME slep < OE slæp, akin to Ger schlaf, sleep, schlaff, loose, lax < IE * slab < base * (s)leb , * (s)lab , loose, slack > LIP, LIMP1, L labor, to slip, sink] 1. a) a natural, regularly recurring condition of rest for the… …   English World dictionary

  • sleep — vb Sleep, slumber, drowse, doze, nap, catnap, snooze mean to take rest by a suspension of consciousness. Sleep, the usual term, implies ordinarily the periodical repose of this sort in which men and animals recuperate their powers after activity …   New Dictionary of Synonyms

  • sleep — sleep·ered; sleep·ful; sleep·ify; sleep·i·ly; sleep; sleep·i·ness; sleep·ing·ly; sleep·less; elec·tro·sleep; sleep·er; sleep·ful·ness; sleep·less·ly; sleep·less·ness; …   English syllables

  • Sleep — unix утилита, выполняющая задержку на указанное время (например, при исполнении shell сценария) Входит, например, в GNU Coreutils. Содержание 1 Использование 2 Параметры запуска 3 …   Википедия

  • sleep — unix утилита, выполняющая задержку на указанное время (например, при исполнении shell сценария) Входит, например, в GNU Coreutils. Содержание 1 Использование 2 Параметры запуска 3 …   Википедия

  • Sleep — Sleep, v. t. 1. To be slumbering in; followed by a cognate object; as, to sleep a dreamless sleep. Tennyson. [1913 Webster] 2. To give sleep to; to furnish with accomodations for sleeping; to lodge. [R.] Blackw. Mag. [1913 Webster] {To sleep… …   The Collaborative International Dictionary of English

  • sleep — ► NOUN 1) a regularly recurring condition of body and mind in which the nervous system is inactive, the eyes closed, the postural muscles relaxed, and consciousness practically suspended. 2) a gummy secretion found in the corners of the eyes… …   English terms dictionary

  • sleep|y — «SLEE pee», adjective, sleep|i|er, sleep|i|est. 1. ready to go to sleep; inclined to sleep: »He never gets enough rest and is always sleepy. 2. Figurative. not active; …   Useful english dictionary

  • Sleep — Sleep, n. [AS. sl[=ae]p; akin to OFries. sl[=e]p, OS. sl[=a]p, D. slaap, OHG. sl[=a]f, G. schlaf, Goth. sl[=e]ps. See {Sleep}, v. i.] A natural and healthy, but temporary and periodical, suspension of the functions of the organs of sense, as well …   The Collaborative International Dictionary of English

  • Sleep — Sleep, v. i. [imp. & p. p. {Slept}; p. pr. & vb. n. {Sleeping}.] [OE. slepen, AS. sl?pan; akin to OFries. sl?pa, OS. sl[=a]pan, D. slapen, OHG. sl[=a]fan, G. schlafen, Goth. sl?pan, and G. schlaff slack, loose, and L. labi to glide, slide, labare …   The Collaborative International Dictionary of English

  • sleep on — To consider overnight, postpone a decision on • • • Main Entry: ↑sleep * * * ˈsleep on [transitive] [present tense I/you/we/they sleep on he/she/it sleeps on present participle …   Useful english dictionary

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