drop off
• fall asleep easily, especially without intending to.
• "struggle as she might, she kept dropping off"
Similar:
fall asleep,
go to sleep,
get to sleep,
doze (off),
have a nap,
catnap,
drowse,
nod off,
go off,
drift off,
snooze,
take forty winks,
get some shut-eye,
crash out,
go out like a light,
flake out,
conk out,
sack out,
zone out,
Opposite:
wake up,
drop-off
noun
• a decline or decrease.
• "a sudden drop-off in tourism"
• a sheer downward slope; a cliff.
• "dizzy drop-offs on either side"
