REMレムFreq.FrequencyTop 50,000Meanings1nounrapid eye movement; REMUsed in contexts of sleep science and psychology, referring to the stage of sleep characterized by rapid eye movements.REM睡眠れむすいみん中ちゅうは脳のうが活かっ発ぱつに活かつ動どうしている。During REM sleep, the brain is actively working.