Nightmare and REM sleep

Nightmare

Nightmare noun - A situation or state that causes great suffering and unhappiness.

REM sleep and nightmare are semantically related. In some cases you can use "REM sleep" instead a noun "Nightmare".

Nearby Word: nightmarish

REM sleep

REM sleep noun - A recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep.
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Synonyms for REM sleep

Nightmare and REM sleep are semantically related. You can use "Nightmare" instead a noun phrase "REM sleep".

Both terms in one sentence

  • 24-Hour Trope Clock Lots of nightmare sufferers wake up around this time, just to rub salt in their wounds.note This is because REM sleep (when you dream) happens during this time.
Cite this Source
REM sleep and Nightmare. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/nightmare/rem_sleep
Nightmare & REM sleep. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/nightmare/rem_sleep>.
REM sleep or Nightmare. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/nightmare/rem_sleep.
Google Ngram Viewer shows how "nightmare" and "REM sleep" have occurred on timeline