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Karo-lina-s [1.5K]
3 years ago
10

Early sleep research began when researchers noted that physiological changes create _______ that can be measured during sleep.

Biology
1 answer:
dalvyx [7]3 years ago
3 0
Hormones -- such as melatonin and cortisol; the former signals the body to go to bed, while the latter signals for the sleeping person to wake up -- are created by physiological changes.
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