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Talya Blatt

on 2 January 2018

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Transcript of Sleep

The Science
of Sleep

Protective Value: we sleep at night, as we are not adapted for hunting/gathering in darkness. Sleeping in darkness keeps us away from dangerous nocturnal predators

Restorative Value: we restore and repair brain tissue and prune unused neural pathways

Memory: we recall better after a good night’s sleep

Creativity: break that sleep provides and even dreams allow us to awaken with a fresh new approach

Growth: Pituitary releases more growth hormone during deep sleep – may explain why we spend less time in deep sleep as we age
Why do we sleep?
Awake and alert: beta waves dominate

Awake but relaxed: alpha waves dominate

Stage 1 Sleep: slowed breathing, irregular, larger brain waves (theta waves), hallucinations, feelings of falling

Stage 2 Sleep: deeper sleep, more difficult to awaken, larger theta waves, sleep spindles, sleeptalking

Stage 3 Sleep: even deeper sleep, difficult to awaken, delta waves begin

Stage 4 Sleep: very deep sleep, delta waves, sleepwalking, bedwetting

REM: rapid brain waves, dreaming, increased heart rate, cortical activity, sexual arousal, “paradoxical sleep”
Sleep Stages
Every 90-Minutes, we cycle through 5 sleep stages several times during the night (Stages 1, 2, 3, 4, and REM)

Researchers monitor brain waves, eye movement, and facial muscle tension to study these stages

Generally, as the night progresses, we experience shorter stage 4 and 3 sleep and longer periods of REM sleep

Over a third of people report never dreaming, though they do they just do not recall

When these sleepers are awakened during REM, they can usually remember their dreams

We spend 20-25% of our sleeping time in REM, dreaming away…
Sleep Trends
Circadian Rhythms

24-hour cycle of biological functioning (circa-diem)

Humans naturally wake with sunlight and sleep when it gets dark

Stimulation of SCN (suprachiasmatic nucleus in hypothalamus) by bright light striking retina’s photoreceptive cells

SCN triggers pineal gland to decrease melatonin
Biological Rhythms
Sleep Disorders
Sleep deprivation is linked with concentration difficulties, irritability, unhappiness, fatigue, illness, obesity, hypertension, and poor motor performance

If you need an alarm clock…if you fall asleep in class…you are sleep deprived!

People who report getting enough sleep also are more likely to report feeling satisfied with their lives!
Sleep Deprivation
REM is important, and when we are deprived of it, we may experience REM Rebound. The loss of muscle tone/paralysis that occurs during REM helps us avoid acting out our dreams. Sleepwalking and night terrors must therefore occur during nREM in most people. REM decreases with age.
Let's identify and diagnose some sleep disorders
Tuesday January 3, 2016
Aim: How do different sleep disorders disrupt sleeping patterns?

PDN: Complete snoring worksheet

Homework: Sleep/ Dream journal due
Wednesday Jan 17th
Time to research some sleep disorders...

Use article to complete chart

Count off by 5
Which plan would work best for BBHS? Why?

What is something you learned from completing this activity in regards to school start times?

What is one way you are going to get more sleep this weekend!?
Sleep Journal Assignment Overview


Aim: How do different sleep disorders disrupt sleeping patterns?

PDN: What sleep disorders are you aware of?

Homework: Sleep/ Dream journal due
Tuesday Jan 17th

Can you identify the sleep disorder?
Tuesday January 2, 2018
Aim: How do different sleep disorders disrupt sleeping patterns?

PDN: Read over Sleep Journal Assignment

Homework: Sleep/ Dream journal due
Wednesday Jan 17th
Full transcript