nyctophonia

nyctophonia

 [nik″to-fo´ne-ah]
loss of voice during the day but not at night.

nyctaphonia

, nyctophonia (nĭk″tă-fō′nē-ă) (nĭk″tō-fō′nē-ă) [″ + a, not, + phone, voice]
Loss of voice during the night.