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1. Be asleep
   - sleep, kip [Brit], log Z's, catch some Z's

1. A natural and periodic state of rest during which consciousness of the world is suspended
   "calm as a child in dreamless slumber";
   - sleep
    
2. A dormant or quiescent state

Derived forms: slumbering, slumbered, slumbers

Type of: dormancy, physical condition, physiological condition, physiological state, quiescence, quiescency, rest

Encyclopedia: Slumber