2. Content
• What is sleep
• Why do we sleep
• Stages of Sleep
• Conculsion
• Reference
3. Sleep
• Sleep is a normal body
process that allows your
body and brain to rest
• But despite how simple it
seems, sleep is one of the
most complex and mysterious
body processes known to
science.
• Periods of sleep and
wakefulness are part of how
our bodies functinon
4. Why do we sleep ?
1. Energy conservation and
storage
2. Self-repair and recovery
3. Brain maintenance
4. Growth
5. Mental Relaxation
5. Stages of
sleep
• Sleep could be subdivided
into two types the Non
rapid eye movment
sleep[NREM] & Rapid eye
movemdnt sleep[REM]
• NREM – Light , Intermediate
and Deep {First 3 stages }
• REM Stage 4
6. Stage 1
• Stage 1 - light Sleep -
sleep is the lightest stage of
sleep. You enter stage 1 right
after you fall asleep. This
stage usually lasts only a few
minutes, making up about 5%
of your sleep time
• 1-5 minutes
7. Stage 2
• Stage 2 – Intermediate
sleep- Stage 2 is still
light sleep, but deeper
than stage 1.
• During this stage,
your brain waves slow
down and have
noticeable pauses
between short, powerful
bursts of electrical
activity.
• Experts think those
bursts are your brain
organizing memories and
information from the
time you been awake.
• This contains 45% of
8. Stage 3
• Stage 3 – Deep sleep –
The deepest stage of
NREM sleep is stage 3.
It makes up about 25%
of your total sleep
time in adults. But
babies and children
need more stage 3
sleep, and the older
you get, the less you
need
• Body tissue repair
occurs at this stage
• BP reduce And
extremely hard to wake
someone from this
stage{sleep inertia}
• Most important stage
9. Stage 4 REM
stage
• Rapid eye movement (REM) sleep
is the stage of sleep where most
dreams happen. Its name comes
from how your eyes move behind
your eyelids while you’re
dreaming
• During REM sleep, your brain
activity looks very similar to
brain activity while you’re
awake.
• REM sleep makes up about 25% of
your total time asleep. Your
first REM cycle of a sleep
period is typically the
shortest, around 10 minutes.
Each one that follows is longer
than the last, up to an hour.
10. Conclusion
• Adults need a out 6-7 hours sleep while
children needs 14-19 hours average
• Death in sleep is mostly caused by cardiac
arrest and seizures
• Most important sleep stage is stage 3 cause it
where most of our cellular repair and growth
occur
• Coma is similar to deep sleep Except no stimuli
can cause a response
11. Reference
• American Academy of Sleep Medicine | sleepeducation.org.
Healthy sleep habits (https://sleepeducation.org/healthy-
sleep/healthy-sleep-habits/). Accessed 6/19/2023.
• Brinkman JE, Reddy V, Sharma S. Physiology of Sleep
(https://www.ncbi.nlm.nih.gov/books/NBK482512). [Updated
2022 Sep 19]. In: StatPearls [Internet]. Treasure Island
(FL): StatPearls Publishing; 2023 Jan-. Accessed 6/19/2023.
• Depner CM, Melanson EL, Eckel RH, et al. Ad libitum Weekend
Recovery Sleep Fails to Prevent Metabolic Dysregulation
during a Repeating Pattern of Insufficient Sleep and Weekend
Recovery Sleep (https://pubmed.ncbi.nlm.nih.gov/30827911/).
Curr Biol. 2019;29(6):957-967.e4. Accessed 6/19/2023.
• Feriante J, Araujo JF. Physiology, REM Sleep
(https://www.ncbi.nlm.nih.gov/books/NBK531454/). [Updated
2023 Feb 13]. In: StatPearls [Internet]. Treasure Island
(FL): StatPearls Publishing; 2023 Jan-. Accessed 6/19/2023.
