n.
a natural and periodic state of rest during which consciousness of the world is suspended
"he didn't get enough sleep last night"
同义词：slumber
a torpid state resembling deep sleep
同义词：sopor
a period of time spent sleeping
"he felt better after a little sleep"
同义词：nap
euphemisms for death (based on an analogy between lying in a bed and in a tomb)
"they had to put their family pet to sleep"
同义词：resteternal resteternal sleepquietus
