circadian rhythm

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circadian rhythm

n.
A daily rhythmic activity cycle, based on 24-hour intervals, that is exhibited by many organisms.

cir·ca·di·an rhythm

(sər-kā′dē-ən)
A daily cycle of biological activity based on a 24-hour period and influenced by regular variations in the environment, such as the alternation of night and day.
Did You Know? Why do you sometimes wake up on time even if your alarm clock doesn't ring? How do nocturnal animals know when it is time to wake up? It's because you—and most other animals—have a kind of internal clock that controls the cycle of the day's biological activities, such as sleeping and waking. These daily biological activities are known as circadian rhythms because they are influenced by the regular intervals of light and dark in each 24-hour day. While the process underlying circadian rhythm is not completely understood, it is mainly controlled by the release of hormones. The brain regulates the amount of hormone released in response to the information it gets from light-sensitive cells in the eye, called photoreceptors. Circadian rhythms can be disrupted by changes in this daily schedule. For example, biologists have observed that birds exposed to artificial light for a long time sometimes build nests in the fall instead of the spring. In humans who travel long distances by air, the local time of day no longer matches the body's internal clock, causing a condition known as jet lag.

circadian rhythm

The regular recurrence of life activities in 24-hour cycles.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.circadian rhythm - a daily cycle of activity observed in many living organisms
biological time - the time of various biological processes
Translations

cir·ca·di·an rhythm

n. ritmo circadiano, ref. a variaciones rítmicas biológicas en un ciclo de 24 horas.
References in periodicals archive ?
The temperature cycle leads the sleep cycle and is an essential factor in achieving rapid sleep onset and high efficiency sleep, they said.
Summary: Interrupting sleep cycle can leave you in a sleep inertia
However, if you find yourself awake midway through your sleep cycle, there is still a high chance that you will feel tired, despite how many hours you have already spent asleep.
Vasopressin is released both more quickly and later on in the sleep cycle. So, if you're waking up earlier, you might miss that window in which more of the hormone is released, causing a disruption in the body's hydration.
"Late bedtimes are often related to technology and social media, with people staying up absorbed by the internet or the television." The blue light from devices also impacts the sleep cycle.
In 2007, the International Agency for Research on Cancer, part of the World Health Organisation, said that shift work which disrupts the sleep cycle is "probably carcinogenic".
A 2015 report from the app Sleep Cycle placed Saudi Arabia second - after Japan - in the list of the world's five worst countries for average sleeping hours.
Where you live, your sex and your age may have something to do with the quality of sleep that you get each night, according to a report from Sleep Cycle Institute.
The Sleep Cycle alarm clock analyzes your sleep and then adjusts your wake-up time based on the lightest phase so that you wake up feeling refreshed instead of groggy and tired.
The innovation offers a controlled, intentional, calm cooling experience that regenerates for every night's sleep cycle. Many cooling products for bedding contain gel pads, gel infused foams or thermal additive based coatings.
"The extra melatonin may help your body fight jet leg and regulate its natural sleep cycle when you arrive in your new time zone."