1.
THE FUNCTIONS AND BENEFITS OF SLEEP
LEARNING OBJECTIVES:
LO1: EXPLAIN what is meant by
Sleep deprivation
LO2: EXPLAIN why sleep is
important

2.
who sleeps most?
18
hours
16
hours
12
hours
10
hours
4
hours
3
hours
2
hours
2 hours 3 hours 4 hours
12 hours 10 hours 12 hours
16 hours 18 hours

3.
How much sleep are you getting
on average per night?
• If you are not
getting the right
amount of sleep
what are the side
effects to your
school
performance?

4.
What happens if we don’t get enough sleep?
poor
concentration
grogginess
17hrs of no sleep is the same
as drinking 2 glasses of wineFact of the day
• If sleep debt were a credit
card, many of us would be in
deep trouble!

5.
SLEEP DEBT and SLEEP DEPRIVATION
SLEEP DEPRIVATION: being kept
awake for at least 24 hours,
which affects physical function
(weight) and brain function
(concentration and memory)
SLEEP DEBT: Having too little
sleep over several days or weeks.
http://www.wsj.com/video/the-effects-of-long-term-sleep-deprivation/ABD69EC5-A9B0-4AF6-B61C-73E36D46CF90.html
Effects of sleep deprivation

6.
ANIMAL STUDIES
Juvet (67) deprived cats of sleep by putting
them on a floating island in a pool so that
when they fell asleep they fell in and woke
up.
They developed abnormal behaviours
and died
Rats lived on a flat circular disk above a
pool of shallow water. The experimental
rat was hooked up to an EEG and when it
showed sleep patterns the carousel would
move, causing rat to walk or fall into the
water.
As long as the experimental rat was awake
the other could sleep. The experimental
rat died after several days.
http://henrynicholls.com/2017/05/06/the-
horrors-of-sleep-deprivation/

7.
THEORIES ABOUT THE FUNCTION OF SLEEP
• RESTORATION THEORY
• Restore bodily energy __________
• Repair the conditions of ___________ and
__________
• Allows ____________ to occur
• Neurotransmitter levels are ____________
• MEMORY CONSOLIDATION THEORY
• REM sleep helps to reinforce _________
People who ___________ just before going
to sleep _____________ more compared
to those who were sleep ___________
• EVOLUTION THEORY
• All animals sleep and therefore a _________
function
• Conserves energy when food gathering is
__________ (or more difficult at night)
• Avoid damage from night time __________
(animals who are highly preyed upon sleep less)
reserves
muscles
cells
growth
replenished
survival
complete
predators
memory
learn deprived
remembered

8.
THE FUNCTION OF SLEEP
• RESTORATION THEORY
• Restore bodily energy reserves
• Repair the conditions of muscles and cells
• Allows growth to occur
• Neurotransmitter levels are replenished
• MEMORY CONSOLIDATION THEORY
• REM sleep helps to reinforce memory
• People who learn just before going to sleep
remembered more compared to those who
were sleep deprived
• EVOLUTION THEORY
• All animals sleep and therefore a survival function
• Conserve energy when food gathering is complete
(or more difficult at night)
• Avoid damage from night time predators (animals
who are highly preyed upon sleep less)
http://www.bbc.com/news/av/health-40360653/what-happens-when-you-re-sleep-deprived
What happens when you are sleep deprived?

9.
Explain why sleep is important
[4 marks]
• Watch this video
• Make notes
• What are the dangers of not enough sleep?
• What is meant by restorative mechanisms? What do they do?
• Make note of key words used
https://www.youtube.com/watch?v=dqONk48l5vY
SLEEP DEPRIVATION 4.30 MIN
Point
Explanation
Elaboration
Link back

10.
Explain why sleep is important
[4 marks]
Sleep plays an important role in our physical and mental well
being. If you don’t get enough sleep it affects performance.
Sleep Restores bodily energy reserves, repairs the conditions of
muscles and cells and allows growth to occur, it is also useful to
consolidate our memory.
Sleep is important for our wellbeing, a teenager on average
needs at least 9 hours of sleep a night.
If we don’t get enough sleep, we become irritable, grumpy and
have a short concentrations span. Animal research also shows
that sleep deprivation results in abnormal behaviour and
death. E.g. Juvet (67)
Sleep Restores bodily energy reserves, repairs the conditions of
muscles and cells and allows growth to occur, it is also useful to
consolidate our memory.
If we don’t get enough sleep, we become irritable, grumpy and
have a short concentrations span. Animal research also shows
that sleep deprivation results in abnormal behaviour and
death. E.g. Juvet (67)
Sleep plays an important role in our physical and mental well
being. If you don’t get enough sleep it affects performance.
Sleep is important for our wellbeing, a teenager on average
needs at least 9 hours of sleep a night.

11.
Explain why sleep is important
[4 marks]
POINT Sleep plays an important role in our physical and mental well being. If you don’t get
enough sleep it affects performance.
EXPLAIN For example, Sleep Restores bodily energy reserves, repairs the conditions of muscles
and cells and allows growth to occur, it is also useful to consolidate our memory.
ELABORATE Therefore, If we don’t get enough sleep, we become irritable, grumpy and have a short
concentrations span. Animal research also shows that sleep deprivation results in
abnormal behaviour and death. E.g. Juvet (67)
LINK This means sleep is important for our wellbeing, a teenager on average needs at least 9
hours of sleep a night.

12.
Who holds the record for staying
awake the longest?
Randy Gardner: 1964, 264.4 hours (11 days 24 minutes).
http://www.sciencealert.com/watch-here-s-what-happened-when-a-teenager-
stayed-awake-for-11-days-straight 4.30min
Some believe the record is held by Toimi Soini from Finland who
claimed to have kept awake for 11 days and 12 hours - or 276 hours
- in February 1964.

13.
The longest recorded period for which a person has voluntarily gone without
sleep is 449 hr (14 days 13 hours) by Mrs. Maureen Weston of Peterborough,
Cambridgeshire in a rocking chair marathon on 14 Apr.-2 May 1977. Though she
tended to hallucinate toward the end of this surely ill-advised test, she
surprisingly suffered no lasting ill effects.
Guinness book of World records 1978 edition
However, Gardner's record is the most frequently cited because it was (and probably still is) the most scientifically rigorous long-term
human sleep-deprivation study, since Gardner was monitored by Dr. William Dement of Stanford University.
The overall problem with determining the record for the longest a person has stayed awake is that people take "microsleeps" without being
aware of it.
To really determine if a person has been constantly awake you'd need to record their brainwaves throughout the experiment. As far as I know,
such a study has never been done.
The Guinness Book of World Records no longer
acknowledges sleep deprivation attempts because it
feels that they're too dangerous

14.
TASK: CREATE YOUR OWN A4
INFOGRAPHIC SHEET ON THE
FUNCTIONS AND BENEFITS OF
SLEEP