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
This is a sophisticated cyberattack where hackers manipulate a system's internal clock to sneak past security defenses.
—
Kurt Knutsson, FOXNews.com, 28 Apr. 2025
When an adolescent goes through puberty, their internal clock changes so that their sleep schedule shifts to later hours.
—Julio Fernandez-Mendoza, The Conversation, 20 Mar. 2025
How Melatonin Affects Sleep Melatonin helps regulate your circadian rhythm system, the body's internal clock that influences your wakefulness throughout the day.
—Kirstyn Hill, Pharmd, Mph, Health, 10 Mar. 2025
These lamps simulate sunlight, helping to regulate your body’s internal clock and boosting mood and energy levels, even regulating sleep and appetite.
—Jené Luciani Sena, Fox News, 27 Feb. 2025
See All Example Sentences for internal clock
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Kurt Knutsson, FOXNews.com, 28 Apr. 2025
When an adolescent goes through puberty, their internal clock changes so that their sleep schedule shifts to later hours.
—Julio Fernandez-Mendoza, The Conversation, 20 Mar. 2025
How Melatonin Affects Sleep Melatonin helps regulate your circadian rhythm system, the body's internal clock that influences your wakefulness throughout the day.
—Kirstyn Hill, Pharmd, Mph, Health, 10 Mar. 2025
These lamps simulate sunlight, helping to regulate your body’s internal clock and boosting mood and energy levels, even regulating sleep and appetite.
—Jené Luciani Sena, Fox News, 27 Feb. 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 May. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share