Other brands contain melatonin, the hormone that maintains your body's circadian clock, but also can make you sleepy.
The profile of this pressure is believed to follow characteristic circadian patterns.
Sleep researchers have found that you can reset your circadian clock fairly easily.
One of the brain centers that is thus permanently damaged is the circadian clock.
Once there, it can produce sleepiness either directly or by acting on the circadian clock.
circadian rhythms are almost impossible to move away from mentally.
The hormone melatonin regulates the circadian rhythm--the sleep cycle.
Reference to length of circadian rhythm also adjusted.
The same is true for circadian rhythms in fruit flies.
On a moon, eclipses would be part of a second circadian rhythm of sorts.
British Dictionary definitions for circadian
circadian
/sɜːˈkeɪdɪən/
adjective
1.
of or relating to biological processes that occur regularly at about 24-hour intervals, even in the absence of periodicity in the environment See also biological clock
Word Origin
C20: from Latin circa about + diēs day
Word Origin and History for circadian
adj.
coined 1959 from Latin circa "about" (see circa) + diem, accusative singular of dies "day" (see diurnal). The original use is in circadian rhythm.
circadian in Medicine
circadian cir·ca·di·an (sər-kā'dē-ən, -kād'ē-, sûr'kə-dī'ən, -dē'-) adj. Relating to biological variations or rhythms with a cycle of about 24 hours.