English Lexicon

Rem-Sleep

/rɛm slɛp/
nounCEFR B2 (Upper)Top #1500 frequency
Full Thesaurus

Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    A phase of sleep characterized by rapid movement of the eyes, increased brain activity, and vivid dreams.

    "During REM sleep, the brain is highly active, and most dreaming occurs."
  2. 2

    A stage of sleep that is essential for cognitive functions such as memory consolidation and emotional regulation.

    "Lack of REM sleep can lead to difficulties in learning and emotional disturbances."

Thesaurus & Semantic Spectrum

Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

The term 'REM sleep' originates from the acronym for 'Rapid Eye Movement,' which was first used in the 1950s to describe a unique phase of sleep characterized by rapid movement of the eyes, increased brain activity, and vivid dreams. The understanding of REM sleep has evolved from early observations of sleep patterns to a critical component of sleep research.

Quick Vocabulary Retention Check

Which of the following is the closest synonym for "Rem-Sleep"?

Thesaurus & Synonyms Graph

Explore Nuanced Synonyms for "Rem-Sleep"

Discover exact matches, context-specific alternatives, and antonyms with intensity ratings in the VocabDictionary Thesaurus.

View "Rem-Sleep" Synonym Map