circadian
adj.adj. relating to a natural daily cycle of about twenty-four hours. You use this to describe things like your body's sleep-wake pattern.
adj. relating to or occurring approximately every twenty-four hours. Often describes biological rhythms that regulate sleep, metabolism, and other physiological processes.
My circadian rhythm is out of sync after traveling across several time zones.
Shift workers often struggle with their health because their circadian rhythms are disrupted by working night shifts.
The study suggests that exposure to artificial light at night can significantly suppress melatonin production, thereby interfering with the body's natural circadian clock and leading to chronic sleep disorders.
From the Latin circā (“about”) and diēs (“a day”) with the English suffix -an. Compare circannual.