s sleep
A1Neutral (Used across all registers from informal to formal, depending on context)
Definition
Meaning
A natural, periodic state of rest for the mind and body, characterized by altered consciousness, reduced sensory activity, and inactivity of voluntary muscles.
A period of this state; to be in this state; a state resembling this, such as dormancy or inactivity; (slang) crust formed in the corners of the eyes after sleeping.
Linguistics
Semantic Notes
The word can function as a countable noun (referring to individual periods of sleep), an uncountable noun (referring to the concept or activity), and an intransitive verb. In informal contexts, it can also be used transitively (e.g., 'to sleep a dreamless sleep').
Dialectal Variation
British vs American Usage
Differences
Minimal. Pronunciation differs slightly (see IPA). Spelling is identical. Some collocations may vary in frequency (e.g., 'sleep in' vs. 'lie in').
Connotations
Largely identical. 'Sleep' is a core, universal concept without strong regional connotations.
Frequency
Equally frequent and fundamental in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
[V] (intransitive): I slept for eight hours.[V + ADV/ADJP]: She sleeps soundly.[V + N] (rare, transitive): He slept the sleep of the just.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “sleep on it (postpone a decision)”
- “let sleeping dogs lie (avoid stirring up old trouble)”
- “lose sleep over (worry excessively)”
- “sleep tight”
- “sleep like a baby”
Usage
Context Usage
Business
Used in contexts of productivity, health, and work-life balance (e.g., 'sleep deprivation impacts decision-making').
Academic
Studied in psychology, neuroscience, and medicine; often appears in research on cognition, health, and biology.
Everyday
The most common context, discussing daily routines, health, and personal well-being.
Technical
In medicine/psychology, refers to specific stages (REM, non-REM); in computing, a low-power state.
Examples
By Part of Speech
verb
British English
- I usually sleep for about seven hours.
- He slept through the entire film.
- Did you sleep well last night?
American English
- I usually sleep around seven hours.
- He slept right through the movie.
- Did you get enough sleep last night?
adverb
British English
- (Rare, usually 'asleep') The baby lay sleeping peacefully.
- (In compounds) She was sleepwalking again.
American English
- (Rare, usually 'asleep') The baby was sleeping soundly.
- (In compounds) He talks in his sleep.
adjective
British English
- She was sleep-deprived before her exams.
- The sleep clinic had a long waiting list.
- He wore his favourite sleep shirt.
American English
- She was sleep-deprived before her finals.
- The sleep center had a long waitlist.
- He wore his favorite sleep T-shirt.
Examples
By CEFR Level
- I need to sleep.
- The baby is sleeping.
- Good night, sleep well!
- I couldn't sleep because of the noise.
- How many hours of sleep do you need?
- He fell asleep on the sofa.
- Sleep deprivation can seriously affect your cognitive abilities.
- After the long flight, I was desperate for a proper sleep.
- She slept through her alarm and missed the meeting.
- The new policy on shift work aims to mitigate the effects of chronic sleep disruption.
- His research focuses on the interplay between sleep architecture and memory consolidation.
- She advocated for a cultural shift that prioritises sleep hygiene.
Learning
Memory Aids
Mnemonic
Think of a sleeping SHEEP. Both words rhyme and share the 'ee' sound.
Conceptual Metaphor
SLEEP IS A JOURNEY (go to sleep, fall asleep, drift off), SLEEP IS A CONTAINER (deep sleep, in a sleep), SLEEP IS A PHYSICAL FORCE (sleep overcame him).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid using 'sleep' as a direct translation for 'dream' (сон). In English, 'sleep' is the state, 'dream' is the mental image. Confusing 'sleep' with 'go to bed' (лечь спать). 'I slept at 10' is incorrect; use 'I went to bed at 10.'
Common Mistakes
- Using 'sleep' as a countable noun incorrectly: 'I had a good sleep' (OK), 'I had two sleeps yesterday' (odd, but sometimes used for children). Overusing 'sleep' in progressive forms: 'I am sleeping' is correct but less common than 'I am asleep' for a current state.
Practice
Quiz
Which of the following uses of 'sleep' is CORRECT?
FAQ
Frequently Asked Questions
'Sleep' is primarily a noun or verb. 'Asleep' is an adjective meaning 'in a state of sleep'. You say 'I am asleep' (current state), not 'I am sleep'. 'I need to sleep' describes the action.
It is usually uncountable when referring to the general concept ('I need more sleep'). It can be countable when referring to a specific period ('I had a long sleep', 'two short sleeps').
Yes, but it is less common than using 'asleep' for a state. 'Sleeping' often emphasises the ongoing activity or is used in specific contexts (e.g., 'a sleeping child', 'I was sleeping when you called').
It means to postpone making a decision until the next day, after you have had time to think about it subconsciously during sleep.