[Trivia] What does the "REM" in "REM sleep" stand for?

[Answer] What does the “REM” in “REM sleep” stand for?

…Sleep stages are categorized as either REM sleep or NREM sleep. NREM sleep — or non-rapid eye movement sleep — happens first and includes three stages, the last of which is deep sleep. REM, or rapid eye movement, sleep, kicks in next, typically around 90 minutes after a person first falls asleep. This stage is when you might experience dreams, because it’s when your brain is more active. The NREM and REM cycle repeats itself throughout the night, with each subsequent REM stage lasting progressively longer.
What does the “REM” in “REM sleep” stand for?

Rapid eye movement:

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