Question

Describe each of the five unique stages of the sleep cycle.

Answer 1

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In general, each cycle moves sequentially through each stage of sleep: wake, light sleep, deep sleep, REM, and repeat. Cycles earlier in the night tend to have more deep sleep while later cycles have a higher proportion of REM. By the final cycle, your body may even choose to skip deep sleep altogether.

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Answer 2

Answer:

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Stage - 1 :

When you first fall asleep, you enter stage 1 of non-REM sleep. This is characterized by the cessation of muscle movement and the slow movement of the eyes behind the eyelid. This is the “twilight” stage of sleep where you are probably still aware of some of the things going on around you. This is a light stage of sleep and you can usually be woken by noises or other disturbances.

Stage - 2 :

This is the stage where you are actually fully asleep and not aware of your surroundings. During stage 2, the heart rate and breathing regulate, the body temperature goes down, the eye movements either slow or stop completely.

Stage - 3 :

Brain waves slow down in stage 3 with only a few bursts of activity. This is a deep sleep where muscles relax and breathing slows even more. This stage of sleep is difficult to awaken from and you may feel disoriented if an alarm or disturbance pulls you out of it.

Stage - 4 :

Stage 4 is an even deeper sleep where the brain waves further slow and sleepers are very difficult to wake. It’s believed that tissue repair occurs during the stage of sleep and that hormones are also released to help with growth.

Stage - 5 :

The final stage of sleep is REM and this is the cycle where we dream. The eyes move rapidly behind the lids and breathing becomes shallow and rapid. Blood pressure and heart rate also increase during REM sleep and the arms and legs are paralyzed so that sleepers can’t act out their dreams. The purpose of this stage (and of dreams) is thought to stimulate the sections of the brain that are needed for memory and learning and a way for the brain to store and sort information. REM sleep occurs approximately 90 minutes into the sleep cycle.