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The body keeps time
Circadian rhythms organise many processes on an approximately 24-hour cycle.
The idea
Internal clocks interact with cues such as light. Timing affects patterns of sleepiness and alertness.
An example
Crossing time zones can put the local light-dark cycle out of step with an internal clock.
Put it into practice
Notice both how long and when you sleep.
Further reading: NIH · NIGMS ↗
Test yourself: What can influence the timing of circadian rhythms?
Light-dark cues
Light is an important cue for aligning internal timing with the environment.
Explanation and illustrative examples by One Card Wiser. Source linked for further reading.
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