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睡眠時間 [すいみんじかん]

(one's) sleeping hours/hours of sleep (noun (common) (futsuumeishi))

睡眠時無呼吸症候群 [すいみんじむこきゅうしょうこうぐん]

sleep apnea syndrome/SAS (noun (common) (futsuumeishi))

睡眠周期 [すいみんしゅうき]

sleep cycle (noun (common) (futsuumeishi))

睡眠障害 [すいみんしょうがい]

sleep disorder (noun (common) (futsuumeishi))

睡眠導入剤 [すいみんどうにゅうざい]

sleep inducing drug (noun (common) (futsuumeishi))

睡眠不足 [すいみんぶそく]

lack of sleep (noun (common) (futsuumeishi), nouns which may take the genitive case particle `no')

睡眠薬 [すいみんやく]

sleeping pill/sleep medication (noun (common) (futsuumeishi))

狸寝入り;たぬき寝入り [たぬきねいり]

feigning sleep (noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru)

泥の様に寝る [どろのようにねる]

to sleep like a log (Ichidan verb) (colloquialism)

徹宵 [てっしょう]

all night/without sleep (noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru)