睡すい眠みん周しゅう期きすいみんしゅうきMeanings1nounsleep cycleTechnical term for the recurring pattern of sleep stages, often used in medical or scientific contexts.睡すい眠みん周しゅう期きは約やく90分ぷんごとに繰くり返かえされる。The sleep cycle repeats about every 90 minutes.
