Meaning of the word hypersomnia in English

What does hypersomnia mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

hypersomnia

US /ˌhaɪ.pɚˈsɑːm.ni.ə/
UK /ˌhaɪ.pəˈsɒm.ni.ə/

Noun