睡すい眠みん剤ざいすいみんざいMeanings1nounsleeping pill; sleeping tabletA medication taken to help fall asleep.昨さく夜やはどうしても眠ねむれなくて、睡すい眠みん剤ざいを飲のんだ。Last night I just couldn't sleep, so I took a sleeping pill.