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
Mutual synonyms
Both terms in one sentence
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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.
Source: 24-Hour Trope Clock
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