SLEEP! Importance of Sleep - PowerPoint Presentation

SLEEP! Importance of Sleep
SLEEP! Importance of Sleep

SLEEP! Importance of Sleep - Description

Sleep Protects Sleeping in the darkness when predators loomed about kept our ancestors out of harms way Sleep Recuperates Sleep helps restore and repair brain tissue Sleep Helps Remembering ID: 634304 Download Presentation


stage sleep brain rem sleep stage rem brain waves approximately minutes begins deep stages slow cycle lasts eye movement falling increased rapid

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Importance of Sleep

Sleep Protects


Sleeping in the darkness when predators loomed about kept our ancestors out of harm’s way.

Sleep Recuperates


Sleep helps restore and repair brain tissue.

Sleep Helps Remembering


Sleep restores and rebuilds our fading memories.

Sleep and Growth


During sleep, the pituitary gland releases growth hormone. Older people release less of this hormone and sleep less.Slide3

The Beginnings of Sleep (sometimes known as

Stage 0


you are actually still relatively awake

(although sometimes drowsy)

brain produces small and fast

beta waves

You may experience





feeling like you are falling or hearing someone call your name


Another very common event during this period is known as a



(aka “

sleep start

” –

when you wake up startled


Stage 1

beginning of the sleep cycle

relatively light stage of sleep

brain produces high amplitude

theta waves

, which are very slow brain waves.

lasts between



Stage 2

brain begins to produce bursts of rapid, rhythmic brain wave activity known as

sleep spindles

lasts for approximately



body temperature starts to decrease and heart rate begins to slow

Stage 3

deep, slow brain waves (

delta waves

) begin to emerge during

transitional period


light sleep and a very deep sleep.Slide5

Stage 4

sometimes referred to as

delta sleep

deep sleep that lasts for approximately



bed-wetting and sleepwalking

are most likely to occur at the end of stage 4 sleep.

Stage 5 (REM Stage)



rapid eye movement

REM sleep is characterized by:

eye movement

increased respiration rate

increased brain activity.

voluntary muscles become paralyzed.Slide6

The Sequence of Sleep Stages

Sleep begins in stage 1 and progresses into stages 2, 3 and 4.

After stage 4 sleep,

stage 3 and then stage 2 sleep are repeated

before entering REM sleep.

Once REM sleep is over, the

body usually returns to stage 2 sleep.

Sleep cycles through these stages

approximately four or five times

throughout the night.

On average,

we enter the REM stage approximately 90 minutes after falling asleep


The first cycle of REM sleep might last only a short amount of time, but

each REM cycle becomes longer. REM sleep can last up to an hour as sleep progresses


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By: alida-meadow
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