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In addition, it can be difficult to find a doctor who knows much about circadian rhythms, as the field of study is quite new.

The period of their circadian rhythm has grown to 47 hours.

Health problems can result from a disturbance to the circadian rhythm.

They know the time because of circadian rhythms the field produces.

Prolonged administration can have an impact upon the circadian rhythm.

"Your normal circadian rhythm is longer than 24 hours in 99 percent of people," he explained.

Circadian rhythms are not the only factors that influence whether you get a good night's sleep.

Exercise may also play a role in determining circadian rhythm.

Light's effect on the circadian rhythms of all or most animals has been well documented.

It, too, is being generated by the body's circadian rhythms.