sleep
/ˈslēp/
noun
the natural, easily reversible periodic state of many living things that is marked by the absence of wakefulness and by the loss of consciousness of one's surroundings, is accompanied by a typical body posture (such as lying down with the eyes closed), the occurrence of dreaming, and changes in brain activity and physiological functioning, is made up of cycles of non-REM sleep and REM sleep, and is usually considered essential to the restoration and recovery of vital bodily and mental functions
a state resembling sleep: such as
a state of torpid inactivity
verb
to rest in a state of sleep
to be in a state (as of quiescence or death) resembling sleep
to have sexual relations —usually used with with