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Definitions

circadian rhythm

NOUN
biological clock
Synonyms
WEAK
biological rhythm biorhythm body clock circadian clock cycles
NOUN
biological rhythm
Synonyms
WEAK
biorhythm body clock cycles internal clock
NOUN
body clock
Synonyms
WEAK
biological rhythm biorhythm circadian clock internal clock

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“I’ve noticed it makes me very low energy because my circadian rhythm relies on the sunrise to really wake up,” said Hannah M. Le, founder of Buckle Scrunchies, a hair-tie brand.

From MarketWatch • Mar. 6, 2026

I’ve learned from experts over and over about how exposing yourself to natural light, even on an overcast day, either resets or talks to your circadian rhythm.

From The Wall Street Journal • Feb. 16, 2026

Scientists examined the heart monitor data using several indicators of circadian rhythm strength.

From Science Daily • Jan. 3, 2026

"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."

From BBC • Nov. 10, 2025

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