Psychology-sleep and dreams part 1

CIRCADIAN RHYTHEM
CIRCADIAN RHYTHEM
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whats a circadian rhythms?
a circadian rhythem is a body clock it controls when you will wake up or sleep it operates over roughly 24hours
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how does your body keep time?
a tiny group of neurons in the hypothalamus controls your bodys circadian rhythm.
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how dose sunlight affect your circadian rhythem?
as sunlight decreases the visual system send signals to the SCN sensing that theres less light outsidethe SCN sends signal to the pineal gland to increases the production of the hormone melatonin this makes you sleepy
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what is melatonin?
melatonin is a sleepy hormone
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what happens when there is no sunlight?
indivduals who are blind from birth often have problems with their sleep cycle because the lack of light
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THE STAGES OF SLEEP
THE STAGES OF SLEEP
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what happensat the 1st stage of sleep
the start of the sleep cycle this is a light stage of sleep. the brain produces very slow brain waves
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what happens at the 2nd stage of sleep
the 2nd stage last about 20mins. the brain produces bursts of rapid rhythmic brain activity. these are called sleep spindels. the body tempearture decreaes and the heart begins to slow
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what happens at the 3rd stage of sleep
deep, slow brain waves called delta waves are produced
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What's happens at the 4th stage of sleep
This is sometimes called a delta wave. Deep sleep lasting about 30 minutes bed wetting and sleep walking may occur
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REM SLEEP
REM SLEEP
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What is REM
REM is when your eyes move rapidly
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When dose REM occur
REM occurs during dream
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Why do dreams occur
Dreaming occurs because of increased brain waves activity and muscles become paralysed
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How can we study sleep
We study sleep by attaching electrodes to our scalp to record the brain waves
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What is EEG
EEG is a way of recording the electrical activity of the brain
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Other cards in this set

Card 2

Front

whats a circadian rhythms?

Back

a circadian rhythem is a body clock it controls when you will wake up or sleep it operates over roughly 24hours

Card 3

Front

how does your body keep time?

Back

Preview of the front of card 3

Card 4

Front

how dose sunlight affect your circadian rhythem?

Back

Preview of the front of card 4

Card 5

Front

what is melatonin?

Back

Preview of the front of card 5
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