Presentation on theme: "SLEEP! Importance of Sleep"— Presentation transcript
Slide1
SLEEP!Slide2
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
hypnagogic
hallucinations
(examples
:
feeling like you are falling or hearing someone call your name
)
Another very common event during this period is known as a
myoclonic
jerk
(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
5-10
minutesSlide4
Stage 2
brain begins to produce bursts of rapid, rhythmic brain wave activity known as
sleep spindles
lasts for approximately
20
minutes
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
between
light sleep and a very deep sleep.Slide5
Stage 4
sometimes referred to as
delta sleep
deep sleep that lasts for approximately
30
minutes
bed-wetting and sleepwalking
are most likely to occur at the end of stage 4 sleep.
Stage 5 (REM Stage)
REM
=
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
.Slide7
