睡

sleep

wink of sleep

nap

half asleep

Japanese Society of Sleep Research

narcolepsy

lack of sleep

(one's) sleeping hours

half asleep and half awake

half awake and half asleep

polysomnography

National Sleep Foundation

short sleeper

sleep cycle

comatose state

to get sleep

hypnopaedia

sleeping sickness

sleep disorder

inactive bank account (no withdrawals or deposits made, and to which the owner's rights have been terminated)

sleep debt

nap

sleep inducing drug

sleeping like a log

sleepwalking

sleeping pill

to doze (off)

doze

doze

having sex with a sleeping person

REM sleep

sleep pattern

polysomnogram

non-REM sleep

microsleep

non-REM sleep

sleeping tablet

to disturb one's sleep

sleep deprivation

sleep apnea syndrome

coma

deep slumber (as if under a spell)

to be extremely sleepy

water lily (any plant of genus Nymphaea)

deep sleep

sleeping while snoring

sleepiness