circadian rhythm

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circadian rhythm:

see rhythm, biologicalrhythm, biological,
or biorhythm,
cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the environment.
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circadian rhythm

[sər′kād·ē·ən ′rith·əm]
(physiology)
A self-sustained cycle of physiological changes that occurs over an approximately 24-hour cycle, generally synchronized to light-dark cycles in an organism's environment.
References in periodicals archive ?
Given that it is common for youth with BP to have an irregular sleep-wake schedule, and a decreased need for sleep during manic phases, an important first step of intervention after the sleep assessment is to identify the correct amount of sleep required by the patient given his/her age and individual differences in needed sleep.
In the study, the researchers experimented with the study participants' sleep-wake schedules during a two-month period.
The [chi square]-test was used to compare categories of preferred sleep-wake schedules.
Individuals are provided information on the effects of poor sleep, maintaining consistent sleep-wake schedules, foods and drinks to avoid (e.
However, all of the disorders are also associated with sleep disturbances, including insomnia, irregular sleep-wake schedules, and hypersomnia.
The hectic nature of a family's lifestyle may influence sleep-wake schedules, but as much as possible maintain a consistent bedtime schedule for your child.
4) CBT interventions combine empirically tested behavioral, cognitive, and educational procedures to alter faulty beliefs and attitudes, modify sleep habits, and regulate sleep-wake schedules.
Our sleep-wake schedules may seem to be ruled by the need to get to school or work on time, but they're really under the control of our body's internal clock.