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sleeping pill; sleep medication

sleeping tablet

(one's) sleeping hours; hours of sleep

lack of sleep

to get sleep; to sleep

sleep inducing drug

REM sleep

hypnopaedia; hypnopedia; sleep-learning

non-REM sleep

sleep disorder

to disturb one's sleep

sleep apnea syndrome; SAS

sleep pattern

narcolepsy

sleeping sickness; sleeping disease

sleep debt; sleep deficit

sleep cycle

sleepwalking; somnambulism

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

polysomnography

polysomnogram

short sleeper; person who doesn't need much sleep

microsleep