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English Lexicon

Deep sleep

/diːp sliːp/
nounCEFR B2 (Upper)Top #4500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    A state of sleep characterized by slow brain waves and reduced responsiveness to external stimuli.

    "During deep sleep, the body undergoes essential restorative processes."
  2. 2

    The stage of sleep that is most restorative and is associated with physical recovery and growth.

    "Children require more deep sleep than adults for proper growth and development."
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Thesaurus & Semantic Spectrum

Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Derived from Old English 'deop' (deep, profound) combined with 'slǣp' (sleep), tracing back to Proto-Germanic roots. The compound has historically referred to the deepest stages of physiological rest characterized by slow-brain-wave activity.

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