Where does “ipnologia” come from?
ipnologia (Italian) comes from Italian Ipno, from Ancient Greek Ὕπνος, from Proto-Hellenic húpnos, from Proto-Indo-European supnós, from Proto-Indo-European swóp-r̥ ~ swép-n̥s, from Proto-Indo-European swep- — to sleep.
ipnologia (Italian): hypnology
Ancestry of “ipnologia”, step by step