Nearby words

  1. sleek,
  2. sleeked,
  3. sleekit,
  4. sleekly,
  5. sleeky,
  6. sleep a wink, not,
  7. sleep apnea,
  8. sleep apnoea,
  9. sleep around,
  10. sleep hygiene

Idioms

    put to sleep, to put (an animal) to death in a humane way: to put a sick old dog to sleep.

Origin of sleep

before 900; (noun) Middle English; Old English slēp (Anglian), slǣp, slāp; cognate with Dutch slaap, German Schlaf, Gothic slēps; (v.) Middle English slepen, Old English slēpan, slǣpan, slāpan, cognate with Old Saxon slāpan, Gothic slēpan

Related formssleep·ful, adjectivesleep·like, adjectivean·ti·sleep, adjectiveun·der·sleep, verb (used without object), un·der·slept, un·der·sleep·ing.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for sleep


British Dictionary definitions for sleep

sleep

/ (sliːp) /

noun

verb sleeps, sleeping or slept


Word Origin for sleep

Old English slǣpan; related to Old Frisian slēpa, Old Saxon slāpan, Old High German slāfan, German schlaff limp

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for sleep
Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for sleep

sleep

[ slēp ]

n.

A natural periodic state of rest for the mind and body, in which the eyes usually close and consciousness is completely or partially lost, so that there is a decrease in bodily movement and responsiveness to external stimuli. During sleep the brain in humans and other mammals undergoes a characteristic cycle of brain-wave activity that includes intervals of dreaming.

v.

To be in the state of sleep.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for sleep

sleep

[ slēp ]

A natural, reversible state of rest in most vertebrate animals, occurring at regular intervals and necessary for the maintenance of health. During sleep, the eyes usually close, the muscles relax, and responsiveness to external stimuli decreases. Growth and repair of the tissues of the body are thought to occur, and energy is conserved and stored. In humans and certain other animals, sleep occurs in five stages, the first four consisting of non-REM sleep and the last stage consisting of REM sleep. These stages constitute a sleep cycle that repeats itself about five times during a normal episode of sleep. Each cycle is longer that the one preceding it because the length of the REM stage increases with every cycle until waking occurs. Stage I is characterized by drowsiness, Stage II by light sleep, and Stages III and IV by deep sleep. Stages II and III repeat themselves before REM sleep (Stage V), which occurs about 90 minutes after the onset of sleep. During REM sleep, dreams occur, and memory is thought to be organized. In the stages of non-REM sleep, there are no dreams, and brain activity decreases while the body recovers from wakeful activity. The amount and periodicity of sleep in humans vary with age, with infants sleeping frequently for shorter periods, and mature adults sleeping for longer uninterrupted periods. See also non-REM sleep REM sleep.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with sleep

sleep

In addition to the idioms beginning with sleep

  • sleep around
  • sleep a wink, not
  • sleep in
  • sleep like a log
  • sleep on something
  • sleep out
  • sleep over
  • sleep through
  • sleep with

also see:

  • let sleeping dogs lie
  • lose sleep over
  • put to sleep

Also see underasleep.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.