1. REM sleep

noun. A recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep.
Synonyms
rapid eye movement sleep sleep paradoxical sleep slumber REM rapid eye movement
Antonyms
aestivate estivate be active wake hibernate
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2. sleep-learning

noun. Teaching during sleep (as by using recordings to teach a foreign language to someone who is asleep).
Synonyms
pedagogy teaching hypnopedia instruction
Antonyms
inactivity

3. sleep

verb. (ˈsliːp) Be asleep.
Synonyms
sleep late rest catnap estivate aestivate hole up nap kip bundle practice bundling log Z's hibernate sleep in catch a wink slumber catch some Z's
Antonyms
aestivate estivate be active wake hibernate
Etymology
sleep (English)
sleep (Middle English (1100-1500))
slæp (Old English (ca. 450-1100))
slepen (Middle English (1100-1500))
slæpan (Old English (ca. 450-1100))

4. sleep

noun. (ˈsliːp) A natural and periodic state of rest during which consciousness of the world is suspended.
Synonyms
rapid eye movement sleep shuteye NREM sleep NREM paradoxical sleep rapid eye movement REM sleeping slumber physical condition nonrapid eye movement sleep physiological condition nonrapid eye movement REM sleep physiological state orthodox sleep
Antonyms
waking action activeness disarrange unpack
Etymology
sleep (English)
sleep (Middle English (1100-1500))
slæp (Old English (ca. 450-1100))
slepen (Middle English (1100-1500))
slæpan (Old English (ca. 450-1100))

5. sleep

noun. (ˈsliːp) A torpid state resembling deep sleep.
Synonyms
sopor physical condition physiological condition physiological state
Antonyms
live out erect impotence estrus hypopigmentation
Etymology
sleep (English)
sleep (Middle English (1100-1500))
slæp (Old English (ca. 450-1100))
slepen (Middle English (1100-1500))
slæpan (Old English (ca. 450-1100))

6. sleep

verb. (ˈsliːp) Be able to accommodate for sleeping.
Synonyms
admit hold accommodate
Antonyms
hypothermia fertility hypocapnia hypercapnia
Etymology
sleep (English)
sleep (Middle English (1100-1500))
slæp (Old English (ca. 450-1100))
slepen (Middle English (1100-1500))
slæpan (Old English (ca. 450-1100))

7. sleep

noun. (ˈsliːp) Euphemisms for death (based on an analogy between lying in a bed and in a tomb).
Synonyms
rest quietus eternal rest death eternal sleep
Antonyms
activity change lie sit stand
Etymology
sleep (English)
sleep (Middle English (1100-1500))
slæp (Old English (ca. 450-1100))
slepen (Middle English (1100-1500))
slæpan (Old English (ca. 450-1100))

8. sleep

noun. (ˈsliːp) A period of time spent sleeping.
Synonyms
period of time nap kip period time period beauty sleep
Antonyms
hyperthermia hyperpigmentation impotency anestrus infertility
Etymology
sleep (English)
sleep (Middle English (1100-1500))
slæp (Old English (ca. 450-1100))
slepen (Middle English (1100-1500))
slæpan (Old English (ca. 450-1100))

9. REM

noun. A recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep.
Synonyms
rapid eye movement sleep sleep paradoxical sleep slumber REM sleep rapid eye movement
Antonyms
be active wake hibernate waking

10. REM

noun. (Roentgen Equivalent Man) the dosage of ionizing radiation that will cause the same amount of injury to human tissue as 1 roentgen of X-rays.
Synonyms
radioactivity unit
Antonyms
aestivate estivate
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