From Middle English sweven, from Old English swefn, from Proto-West Germanic *swefn, from Proto-Germanic *swefną, *swefnaz, from Proto-Indo-European *swépnos, *supnós, from Proto-Indo-European *swep-. Cognate with Dutch suf ("drowsy"), Middle High German swēb ("sleep"), Danish søvn ("sleep"), Icelandic svefn ("sleep"), Norwegian søvn ("sleep"), Swedish sömn ("sleep"), Latin somnus ("sleep, slumber, drowsiness"), Sanskrit स्वप्न, Ancient Greek ὕπνος.
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