diurnal
Meaning: active during the day; occurring daily
Usage: The diurnal animal searched for food during the day and rested after sunset.
nocturnal
Meaning: relating to or occurring during the night
Usage: Jackie was a nocturnal person; she would study until dawn and sleep until the evening.
quotidian
Meaning: daily
Usage: Ambika’s quotidian routines include drinking two cups of coffee in the morning.