sleep
noun
a natural and periodic state of rest during which consciousness of the world is suspended
“he didn't get enough sleep last night”
“calm as a child in dreamless slumber”
Synonymsslumbera torpid state resembling deep sleep
Synonymssopora period of time spent sleeping
“he felt better after a little sleep”
“there wasn't time for a nap”
Synonymsnapeuphemisms for death (based on an analogy between lying in a bed and in a tomb)
“she was laid to rest beside her husband”
“they had to put their family pet to sleep”
verb
be asleep
Oppositeswakebe able to accommodate for sleeping
“This tent sleeps six people”
Source: WordNet 3.1, Princeton University