circadian

[sur-key-dee-uhn]

adjective

Physiology.

1. of or relating to a biorhythm or regular biological cycle occurring once every 24 hours, such as waking and sleeping.

   Exposure to blue light at night can disrupt your circadian rhythm, making your biological clock think it's earlier in the day rather than time for bed.

   He is doing research related to the circadian cycling of hormones.

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 History and Origins

Origin of circadian¹

First recorded in 1955–60; from circā “about” + Latin di(ēs) “day” + -an ( def. ); circa ( def. )

Word History and Origins

Origin of circadian¹

C20: from Latin circa about + diēs day

Example Sentences

"These things are not rocket science, but they're really fundamental to having a good, healthy circadian rhythm and a good healthy physiology through the winter."

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These patterns hint at a close relationship between Alzheimer's progression and the circadian system -- the internal body clock that regulates sleep, wakefulness, and other daily biological cycles.

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Horner noted that future studies could test whether reducing screen exposure in the hours before bedtime, when screen light may disrupt circadian rhythms and delay sleep onset, helps lower cardiometabolic risk.

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The study, published in Nature Aging, explored how changes in the circadian system affect brain health and memory in mouse models of Alzheimer's disease.

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She notes the importance of keeping waking and sleeping times similar throughout the year to regulate your circadian rhythm.

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Related Words

• constantly 
• day-to-day 
• everyday 
• often 
• periodic 
• regular 
• regularly 
• routine