Where does “insomnia” come from?

Insomnia comes from Latin insomnia, formed from Latin in plus Latin somnus, ultimately from Proto-Indo-European swep- meaning to sleep.

insomnia (English): A sleeping disorder that is known for its...

Definitions

Step	Language	Word	Meaning
1	Latin	īnsomnia	—
2	Latin	īnsomnis	—
3	Latin	in- -is	—
4	Latin	īn-	—
5	Latin	în	—
6	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
7	Proto-Italic	en	in
8	Proto-Indo-European	h₁én	in

insomnia — Etymology, Origin & Word History | Etymology Explorer