(n)sleep, slumbera 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”
(n)rest, eternal rest, sleep, eternal sleep, quietuseuphemisms 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”