Circadian rhythms are human 90-minute cycles of variation in levels of alertness.

Name: Circadian rhythms are human 90-minute cycles of variation in levels of alertness.
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Circadian rhythms are roughly 24-hour cycles in the physiological processes of living beings, including humans, affecting various biological functions such as sleep-wake patterns, not 90-minute cycles. The 90-minute cycles refer to the ultradian rhythms, which govern shorter physiological activities such as stages of sleep.

Circadian Rhythms Are Human 90-Minute Cycles of Variation in Levels