body clock


: the internal mechanisms that schedule periodic bodily functions and activities
usually not used technically

Example Sentences

It takes a while for my body clock to get adjusted when I fly from New York to London.
Recent Examples on the Web But doctors don't have an easy way to check the body clock. Elizabeth Preston, Discover Magazine, 27 Aug. 2012 Melatonin is crucial in sleep regulation and its suppression muddles with the body’s circadian rhythm, or the internal body clock. Carla Delgado, Discover Magazine, 7 Sep. 2022 This cycle has set our circadian rhythm, or body clock, for centuries. Sandee Lamotte, CNN, 6 Nov. 2022 Standard time has the best correlation between the sun's cycle and your body clock. CBS News, 6 Nov. 2022 Melatonin, the sleep-inducing hormone, may lower the body’s glucose tolerance, signaling that metabolism is influenced by the body’s circadian rhythm or body clock. Byalexa Mikhail, Fortune, 4 Oct. 2022 When the sun goes down, the body clock turns melatonin production back on, and a few hours later sleep arrives. Sandee Lamotte, CNN, 19 Sep. 2022 That spectrum of light has a longer wavelength, and is less intrusive and disruptive to our circadian rhythm, or body clock, than shorter wavelengths such as blue light. Sandee Lamotte, CNN, 22 June 2022 Our core body temperature, which correlates to the body clock, decreases before bed as sleep-promoting melatonin levels rise. Alexa Mikhail, Fortune, 24 July 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'body clock.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1916, in the meaning defined above

Time Traveler
The first known use of body clock was in 1916

Dictionary Entries Near body clock

Cite this Entry

“Body clock.” Dictionary, Merriam-Webster, Accessed 1 Feb. 2023.

Medical Definition

body clock

: the internal mechanisms that schedule bodily functions and activities
not usually used technically
Last Updated: - Updated example sentences
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