Where does “swápnas” come from?

swápnas (Proto-Indo-Aryan) comes from Proto-Indo-Iranian swápnas, from Proto-Indo-European swépnos, from Proto-Indo-European swopnos, from Proto-Indo-European swep- — to sleep.

Ancestry of “swápnas”, step by step

StepLanguageWordMeaning
1Proto-Indo-Iranianswápnassleep, sleeping; dreaming
2Proto-Indo-Europeanswépnossleep, slumber
3Proto-Indo-Europeanswopnosdream
4Proto-Indo-Europeanswep-to sleep
Every word from Proto-Indo-European swep- →Every word from Proto-Indo-European swopnos →Every word from Proto-Indo-European swépnos →