Where does “sъniti” come from?

sъniti (Proto-Slavic) comes from Proto-Slavic sъ̀nъ, from Proto-Balto-Slavic supnas, from Proto-Indo-European supnós, from Proto-Indo-European swóp-r̥ ~ swép-n̥s, from Proto-Indo-European swep- — to sleep.

Ancestry of “sъniti”, step by step

StepLanguageWordMeaning
1Proto-Slavicsъ̀nъsleep, dream
2Proto-Balto-Slavicsupnassleep, dream
3Proto-Indo-Europeansupnóssleep; death
4Proto-Indo-Europeanswóp-r̥ ~ swép-n̥s
5Proto-Indo-Europeanswep-to sleep

Words derived from “sъniti

Every word from Proto-Indo-European swep-Every word from Proto-Indo-European swóp-r̥ ~ swép-n̥sEvery word from Proto-Indo-European supnós