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Definitions

circadian

[sur-key-dee-uhn] / sɜrˈkeɪ di ən /


Example Sentences

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The pineal gland produces melatonin, a hormone that helps control the circadian rhythm.

From Science Daily Jul. 26, 2026

Instead, the group representing sleep doctors favors permanent standard time, saying it aligns best with a human’s circadian rhythm, meaning your body’s natural clock.

From MarketWatch Jul. 15, 2026

Stanford professor Jamie Zeitzer, a physiologist who studies circadian cycles and how humans respond to light, supports ending the twice-a-year time changes.

From Los Angeles Times Jul. 14, 2026

Light sets our circadian rhythm, or 24-hour body clock, which tells us when to wake up.

From BBC Jul. 6, 2026

Not only was this arrangement bad for the astronaut’s circadian rhythm, but the astronaut who was on duty made enough noise as he went about his work to keep his partner awake.

From "Flying to the Moon: An Astronaut's Story" by Michael Collins




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