Chapter 9 – Sleep, Dreaming, and Circadian Rhythms

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7 Terms

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Nocturnal

Active during the night

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Diurnal

Active during the day

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Crepuscular

Active during dawn and dusk.

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Dolphin sleeping patterns

Only half of the brain sleeps at a time (unihemispheric sleep).

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Melatonin

Hormone that regulates sleep-wake cycles.

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REM

Rapid Eye Movement sleep associated with dreaming.

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Hypocretin (orexin)

Neurotransmitter that regulates arousal and wakefulness.