Transcript 4 Stages of Sleep

Sleep
Everyone’s favorite pastime
Catching some zzzzzzs
Are you aware that you spend one
third of your life asleep?
Why do we sleep?
Why do we dream?
Why do some of us have trouble
getting to sleep or experience
nightmares?
The Stages of Sleep
Sleep researchers have discovered that
we sleep in stages.
There are 4 stages of sleep
Stage 1
Stage 1 is the stage of lightest
sleep
Stage 1
In stage 1 your pulse slows A BIT, And your
muscles relax, but your breathing
becomes uneven and your brainwaves
grow irregular.
If you were to awake you would think you
were just drifting.
This phase lasts for about ten minutes.
Stage 2
Stage 2
During stage 2 sleep, brain wave activities
begin to get irregular.
We’re soundly asleep at this stage, but we
may not think were actually sleeping.
Example:
My wife wakes me up while I’m sleeping in
front of the television all the time to tell
me that I’m snoring, but I always tell her
that I wasn’t sleeping. I must have been
snoring while awake.
Stage 3
Stage 3
Your eyes roll slowly from side to side. You
fall into an even deeper sleep.
We spend about an hour and a half in stage
3.
Stage 4
Stage 4
During stage 4 , our eyes begin to move
back and forth very rapidly, which is called
rapid eye movement.
REM
Now were in REM sleep, the sub-stage in
which the brain is active, but were asleep.
R.E.M.
We Dream in REM Sleep. After we reach
REM sleep, about an hour and a half into
the whole sleep process, the rest of the
night is characterized by alternating
periods of REM sleep and Non-REM sleep
(activity seen in Stages 1,2 , and 3).
Why do we Sleep?
I don’t necessarily know why other people
sleep, but I usually sleep because I’m
tired.
For the most part, researchers still don’t
know why we sleep, but some believe it
has a restorative function.
Research that looks at the effects of the
lack of sleep, or sleep deprivation,
suggests that we engage in sleep so that
our body can restore what was lost or
damaged during our waking hours.