Nocturnality refers to organisms that are active during the night, while resting during the day. Synonyms for this term may include night-time activity, twilight activity, or nocturnal behavior. Other expressions that can be used are night owl behavior, evening-centric activity, or nighttime orientation. Additionally, the biological term crepuscular can be used to describe animals that are most active during dawn and dusk. Overall, there are many different ways to describe the behavior of animals that are active during the night, and while each term has its own nuances, they all imply a preference or necessity for activity in the dark.