internal clock
noun
1
: a system in the body that controls when a person needs to sleep, eat, etc.
The long trip upset my internal clock and I had a hard time getting to sleep.
2
: a clock or timing device that is inside a computer
Examples of internal clock in a Sentence
Recent Examples on the Web
Lack of ample sleep throws off your body's internal clock, triggering a surge in stress hormones that cause blood vessels to narrow and blood pressure to rise.
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Md Published, Verywell Health, 19 Sep. 2025
Disruptive blue wavelengths can wreak havoc on the body’s internal clock, even suppressing the production of melatonin—a hormone that helps regulate our circadian rhythm.
—Laura Kiniry, Popular Science, 17 Sep. 2025
Fall fatigue is often linked to the decrease in sunlight, which disrupts your body’s internal clock (circadian rhythm) and can lower serotonin levels, a key mood-regulating hormone.
—Bryan Robinson, Forbes.com, 16 Sep. 2025
But every person’s internal clock is different, and so are the various elements that can impact your optimal bedtime.
—Korin Miller, Outside, 12 Sep. 2025
See All Example Sentences for internal clock
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Md Published, Verywell Health, 19 Sep. 2025
Disruptive blue wavelengths can wreak havoc on the body’s internal clock, even suppressing the production of melatonin—a hormone that helps regulate our circadian rhythm.
—Laura Kiniry, Popular Science, 17 Sep. 2025
Fall fatigue is often linked to the decrease in sunlight, which disrupts your body’s internal clock (circadian rhythm) and can lower serotonin levels, a key mood-regulating hormone.
—Bryan Robinson, Forbes.com, 16 Sep. 2025
But every person’s internal clock is different, and so are the various elements that can impact your optimal bedtime.
—Korin Miller, Outside, 12 Sep. 2025
See All Example Sentences for internal clock
Cite this Entry
“Internal clock.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/internal%20clock. Accessed 29 Sep. 2025.
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