Which of the following is true of human sleep cycles?     There is usually about 15 minutes between sleep cycles.     Sleep cycles are random across the night.     Stages 3 and 4 of slow-wave sleep mostly occur in the early morning hours (at the end of the sleep cycle).     "As the night goes on, the relative length of REM sleep increases in each successive cycle."

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Q: Why is sleep important for our body? Name one thing that evidence supports why sleep is necessary.…

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Q: 3. List and briefly describe the stages of the human sleep cycle. Why are sleep and…

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Q: What are two things you could change or add to your nighttime routine for a higher quality of sleep?

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Q: Briefly, how would you define what sleep is?

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Q: Describe the biological process of the sleep–wake cycle.

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Q: What is the most environmental cue for entrainment of circadian rhythms?

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Q: Are our sleep cycles a genetic trait, or does our environment play a larger role?

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Q: Distinguish NREM sleep from REM sleep?

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Q: What kind of animal tends to get more than the average amount of sleep?

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Q: Describe the brain mechanisms of waking and sleeping.

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Q: Describe the functions and physiology of sleep.

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Q: Conceptualize a problem of REM sleep.

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Sleep Physiology

Sleep is a condition of reduced muscle movement in the body. Awareness about the surroundings is reduced at the time of sleep. The body stays mildly responsive or non-responsive to external stimuli. The sleep-wake cycle is controlled by the circadian rhythm that produces a resting phase for the body.