Where does “sono” come from?

sono (Old Portuguese) comes from Latin somnus, from Proto-Italic swepnos, from Proto-Indo-European swépnos, from Proto-Indo-European swopnos, from Proto-Indo-European swep- — to sleep.

Ancestry of “sono”, step by step

StepLanguageWordMeaning
1Latinsomnussleep; drowsiness, slumber sloth, idleness; death
2Proto-Italicswepnos—
3Proto-Indo-Europeanswépnossleep, slumber
4Proto-Indo-Europeanswopnosdream
5Proto-Indo-Europeanswep-to sleep

Words derived from “sono”

Every word from Proto-Indo-European swep- →Every word from Proto-Indo-European swopnos →Every word from Proto-Indo-European swépnos →