Sleep and Dreams


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Sleep and Dreams

  1. 1. Sleep And Dreams Part 1 Patricia Bassey
  2. 2. What we will cover What is sleep? Stages of sleep Why do we sleep? Effects of sleep deprivation Video clip on sleep deprivation Sleep Variations Conclusion Questions 1
  3. 3. What is sleep? Sleep is a naturally recurring state characterized by reduced or absent consciousness, relatively suspended sensory activity, and inactivity of nearly all voluntary muscles. OR It is a natural and periodic state of rest during which consciousness of the world is suspended. 2
  4. 4. Stages of sleep Each and every night, your brain passes through five stages of sleep. Passing through all these stages takes about 90-110 minutes and marks one full sleep cycle. So, if you sleep soundly for eight hours per night, you're getting five full sleep cycles. 3
  5. 5. Stages of sleep Stage 1 is a light sleep and you are easily woken. This stage lasts about five minutes. Your eyes move slowly under the eyelids, muscle activity slows down, and you are easily awakened. Stage 2 is marked by a loss of nearly all muscle. This is the first stage of true sleep, lasting from 10 to 25 minutes. Your eye movement stops, heart rate slows, and body temperature decreases. Stage 3 is the beginning of a deep sleep, also known as Slow Wave Sleep. It is harder to rouse someone from a deep sleep, but if you are woken you will feel especially dopey and confused for a couple of minutes. 4
  6. 6. Stages of sleep (Cont.) Stage 4 is the deepest kind of Slow Wave Sleep. This stage replenishes your energy both physically and mentally, and without enough deep . In this deepest stage of sleep, your brain waves are extremely slow. Blood flow is directed away from your brain and towards your muscles, restoring physical energy. REM Sleep marks the onset of dreaming. About 70 to 90 minutes after falling asleep, you enter REM sleep, where dreaming occurs. Your eyes move rapidly, your breathing shallows, and your heart rate and blood pressure increase. Also during this stage, your arm and leg muscles are paralyzed. 5
  7. 7. Why do we sleep?  Sleep Theory #1 - To Rest : to gain relief from this hyperactive state.  Sleep Theory #2 - To Heal : Sleep also allows us to heal our bodies. the immune system (our ability to fight disease) sleep deprivation affects our metabolism (our internal chemical reactions). It may also help us save energy for when we most need it.  Sleep Theory #3 - To Learn : Sleep may help the human brain get better organized - by filing away important memories and discarding unwanted information.  Sleep Theory #4 - To Dream : Dreaming appears to be a by-product of REM sleep. So is it possible that the main reason why we sleep is to dream? If so, why do we dream? 6
  8. 8. Effects of sleep deprivation  Fatigue, lethargy, and lack of motivation  Moodiness and irritability  Reduced creativity and problem-solving skills  Inability to cope with stress  Reduced immunity; frequent colds and infections  Concentration and memory problems  Weight gain  Impaired motor skills and increased risk of accidents  Difficulty making decisions  Increased risk of diabetes, heart disease, and other health problems 7
  9. 9. Video Clip A Video on sleep deprivation showing the negative effects it has on the brain ( 8
  10. 10. Sleep Variation Sleep is a natural state of rest seen in mammals, birds, reptiles, amphibians and fish. There is variation of sleep between animals: Bats........................20 hours Lions......................13.5 hours Laboratory rats......13 hours Domestics cats.......12.5 hours Baboons.................9.5 hours Humans..................8 hours Pilot whales............5.5 hours Asian elephants......3 hours Roe deer.................3 hours Giraffes...................2 hours 9
  11. 11. Conclusion Lack of sleep is stressful and has an impact on the body and the brain. When deprived of sleep people have trouble paying attention to task and solving problems. Sleep is not exactly a time when your body and brain shut off. While you rest, your brain stays busy, overseeing a wide variety of biological maintenance that keeps your body running in top condition, preparing you for the day ahead. Without enough hours of restorative sleep, you won’t be able to work, learn, create, and communicate at a level even close to your true potential. 10
  12. 12. Questions 11