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Russian word сон comes from Proto-Indo-European *seup-, Proto-Indo-European - nós, Proto-Indo-European *sup-n-o-, and later Proto-Indo-European *supnós (Death. Sleep.)
*seup- (Proto-Indo-European)
- nós (Proto-Indo-European)
*sup-n-o- (Proto-Indo-European)
*swopnos (Proto-Indo-European)
dream
*swópniyom (Proto-Indo-European)
*supnós (Proto-Indo-European)
Death. Sleep.
*su(o)pnum (Proto-Balto-Slavic)
*supnas (Proto-Balto-Slavic)
Sleep.
*sъpnъ (Proto-Slavic)
*sъnъ (Proto-Slavic)
Sleep, dream.
сон (Russian)
Dream (imaginary events seen in the mind while sleeping). Sleep.