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Rapid Eye Movement or REM follows after the four stages of NREM (non-REM) sleep and occupies about one-fifth of total rest time in adults.
During REM, all vivid dreaming takes place. Our internal temperature is at its lowest. Our heart rate increases and our breathing is irregular. Generally, our muscles are immobilized, and we are incapable of physical response, except for our eyes and ears. However, our brain is fully active.
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When we fall asleep, the nearly 86 billion neurons in our brain starts to fire evenly and rhythmically. Our sensory receptors become muffled at the same time.
The first stage of shallow sleep lasts for about 5 minutes.
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We can remain in stage 4 - similar to a coma or brain death - for only about 30 minutes before the brain wakes up and falls back to sleep again.
Even healthy sleepers wake several times a night, but might not be aware of it.
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Thomas Edison said that sleep is "a bad habit." Like Edison, we seem to think of sleep as an adversary and try to fight it at every turn. The average American sleeps less than the recommended seven hours per night, mostly due to electric lights, television, computers, and smartphones.
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Our molecular clock inside our cells aims to keep us in sync with the sun.
When we disregard this circadian rhythm, we are at a greater risk for illnesses such as diabetes, heart disease, and dementia.
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Some scientists consider stage 3 and 4 to be one stage. Your body rests during these stages to help cells recover. Your cells produce the most growth hormone here to mend your bones and muscles.
While all this is happening, your muscles are fully relaxed. Mental activity is limited, includ...
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We spend about half our sleeping time in stage 2. It can last up to 50 minutes during the first 90-minute sleep cycle, and less during subsequent cycles.
During this time the brain consolidates the information that has been collected during the waking hours. It makes connections yo...
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Sleep is essential for maintaining a healthy immune system, body temperature and blood pressure. The lack of sleep prevents us from regulating our moods well or recovering promptly from injuries.
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Other curated ideas on this topic:
REM, the Rapid Eye Movement stage of sleep happens when our eyes are moving fast; we are said to be dreaming in that stage.
NREM (Non-Rapid Eye Movement) is the stage of sleep when we are in deep sleep and are not moving. In this stage, our brain is able to clear toxins and con...
Dreaming accounts for 20% of our sleeping time.
The length of dreams can vary from a few seconds to almost an hour. During REM sleep, the brain is highly active. The muscles are paralyzed, and the heart rate increases. Breathing can become erratic.
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