nocturnality

noun

noc·tur·nal·ity | \ ˌnakˌtərˈnalətē\

variants: or less commonly nocturnalism \ näkˈtərnᵊlˌizəm \

plural nocturnalities also nocturnalisms

Definition of nocturnality

: the condition of being nocturnal many rodents exhibit strict nocturnality