rested with eyes closed in a state of sleep; past tense of sleep.
From Old English 'slæpan,' which may be related to Old Saxon 'slapon.' The origins are uncertain but possibly connected to Proto-Germanic roots meaning 'to drop' or 'to fall,' reflecting how sleep comes over you.
Scientists still don't fully understand why we sleep, but we know that all mammals do it, which means 'sleep' is probably one of the oldest behaviors captured by human language—older than civilization itself.
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