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Definitions

internal clock

NOUN
biological rhythm
Synonyms




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.

During adolescence, the body's internal clock naturally shifts later, meaning teenagers tend to feel alert later at night than adults do.

From Science Daily • Mar. 11, 2026

When it is bright, our internal clock feels we should be awake.

From BBC • Apr. 16, 2025

Additionally, disruptions to the body's internal clock can affect astronaut's sleeping and eating cycles.

From Salon • Mar. 15, 2025

“There are gonna be some people that wake up at 3 in the morning, probably wide awake. Everybody’s internal clock is different. But we’re doing everything we can.”

From Los Angeles Times • Mar. 15, 2024

Either by his internal clock or Chubs’s excited squeaks, Liam woke first.

From "The Darkest Minds" by Alexandra Bracken