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Old Norse svefn
← Old English swefn (cognate)
← Old Church Slavonic съпати (cognate)
← English sweven (cognate)
← Proto-Germanic *swefnaz (inherited)
← Ancient Greek ὕπνος (cognate)
← Proto-Indo-European *swep- (root)
← Proto-Indo-European *swépnos (inherited)
← Proto-Indo-European *swep- (mention)
← Latin somnus (cognate)
← Latvian sapnis (cognate)
← Old Saxon sweban (cognate)
← Russian спать (cognate)
← Old Irish suan (cognate)

→ Old English swefn (cognate)
→ Danish søvn (inherited)
→ Danish søvne (mention)
→ Middle English sweven (mention)
→ Faroese svøvnur (derived)
→ Westrobothnian sɑmn (mention)
→ Old Swedish symn (derived)
→ Icelandic svefn (inherited)
→ Norwegian Bokmål søvn (inherited)
→ Norwegian Bokmål søvnig (mention)
→ Norwegian Bokmål søvne (mention)
→ Norwegian Nynorsk søvn (inherited)
→ Norwegian Nynorsk søvnig (mention)
→ Norwegian Nynorsk søvne (mention)
→ Swedish sömn (derived)