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T Sleep: The Basics PowerPoint F 1. The biological clock that controls our sleep/wake cycle involves light perception by the retina, which signals the brain to release hormones. T F 2. Levels of the hormone melatonin influence our sleepiness by rising during the night and declining at dawn. I F 3. The circadian clock in humans cycles twice a day at about 12-hour intervals. I F 4. During sleep, humans experience repeated cycles of non-rapid eye movement (NREM) and rapid eye movement (REM) sleep. I F 5. The NREM phase is repeated three to six times per night and gradually decreases while the amount of REM sleep increases as the night progresses.

Answer 1

Answer: True

The biological clock that controls the sleep/wake process involves the light perception by the retina which signals the brain to release hormones. When the retina perceives the light, the cerebral structure instantly gets stimulated which control the mood, alertness or sleep.