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
Natural light helps regulate your circadian rhythm—aka, your body’s internal clock that governs sleep-wake cycles and the production of hormones like melatonin.
—
Allison Forsyth, Health, 9 June 2026
Key Takeaways Your body has an internal clock and reflexes that make morning the most common time to have a bowel movement (poop).
—Brandi Jones, Verywell Health, 3 June 2026
Per the American Heart Association’s scientific statement on circadian health, the body’s internal clock regulates cellular repair, hormone release and immune function on a precise schedule — and irregular timing throws that schedule off regardless of how many total hours are logged.
—Allison Palmer, Charlotte Observer, 19 May 2026
How Shift Work Disrupts Your Body Clock The circadian rhythm is a roughly 24-hour internal clock regulated primarily by light.
—Allison Palmer, Fort Worth Star-Telegram, 16 May 2026
See All Example Sentences for internal clock
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Allison Forsyth, Health, 9 June 2026
Key Takeaways Your body has an internal clock and reflexes that make morning the most common time to have a bowel movement (poop).
—Brandi Jones, Verywell Health, 3 June 2026
Per the American Heart Association’s scientific statement on circadian health, the body’s internal clock regulates cellular repair, hormone release and immune function on a precise schedule — and irregular timing throws that schedule off regardless of how many total hours are logged.
—Allison Palmer, Charlotte Observer, 19 May 2026
How Shift Work Disrupts Your Body Clock The circadian rhythm is a roughly 24-hour internal clock regulated primarily by light.
—Allison Palmer, Fort Worth Star-Telegram, 16 May 2026
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 12 Jun. 2026.
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