Conceptual image depicting sleep and wakefulness

Conceptual image depicting sleep and wakefulness

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Caption: Biological clock. Conceptual computer image depicting human biorhythms, showing the face of a woman during sleep and wakefulness. Processes such as wakefulness and tiredness are based on a daily or circadian (24 hour) cycle regulated by hormones such as melatonin and cortisol.

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Keywords: asleep, asleep and awake, awake, biological clock, biorhythm, circadian clock, circadian rhythm, concept, conceptual, daily rhythms, face, lifestyle, rest resting, rhythm, sleep, sleep and awake, sleep sleeping, woman, woman's face

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