Stages Of Sleep


Stages of Sleep

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You will have a hard time waking up someone whose sleep is already at stages 3 or 4 or in deep sleep where there is no more eye movement or muscle activity. The first sleep cycle each night is characterized by short REM periods and long periods of deep sleep. In the morning, people spend their sleep time in stages 1,2, and REM sleep stages. According to research, we spend 50 % of our sleep time in stage 2 sleep, about 20 % in REM sleep, and 30 % in other sleep stages. Others resort to alcohol which only leads to light sleep, but deprives them of REM and deeper, more restorative stages of sleep.

REM sleep is the last stage where breathing becomes faster, irregular and shallow. Dreams are experienced during REM sleep stage.

The first sleep cycle each night is characterized by short REM periods and long periods of deep sleep. In the morning, people spend their sleep time in stages 1,2, and REM sleep stages. According to research, we spend 50 % of our sleep time in stage 2 sleep, about 20 % in REM sleep, and 30 % in other sleep stages.

Sleep and being awake are affected by different neurotransmitter signals in the brain. A lot of people suffering from insomia try to induce sleep by taking over the counter sleeping pills. Others resort to alcohol which only leads to light sleep, but deprives them of REM and deeper, more restorative stages of sleep.

Sleep has five phases. During the first stage, sleep is light and can be easily awakened. At this stage, the eyes move very slow as well as muscle activity. Oftentimes, when a person is awakened, sudden muscle contractions occur as if you are falling off. At stage 2, eye movements stop and brain waves turn slower with intermittent burst of rapid waves known as “sleep spindles”. In stage 3, delta waves start to appear. These are extremely slow brain waves interspersed with smaller, faster waves. During stage 4, only delta waves are being produced by the brain. You will have a hard time waking up someone whose sleep is already at stages 3 or 4 or in deep sleep where there is no more eye movement or muscle activity. People who are awakened during deep sleep experience temporary disorientation. It is also during deep sleep stage that children experience bedwetting, night terrors, or sleepwalking.

To Sleep, Perchance to Dream - Crash Course Psychology #9

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Why do we sleep? Well... that's a tricky question. More easily answered is the question,"How do we sleep?" In this episode of Crash Course Psychology, Hank discusses some of the ways our brain functions when sleeping and how it can malfunction as well.

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Table of Contents

Four Stages of Sleep 02:38
Why We Dream 04:28
Information Processing 08:13
Physiological Function 08:31
Cognitive Development 08:52
Neural Activity Models 09:04

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