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020107_Consc2_post - States of Consciousness Sleep Sleep A...

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    States of Consciousness Sleep
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    Sleep A typical night’s sleep Why do we sleep? What causes sleep? Circadian Rhythms Sleep deprivation & restoration Individual differences Need for sleep Morningness Sleep disorders
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    Stages of Sleep Awake:  Beta Relaxed:  Alpha Stage 1:  Theta body jerks Stage 2:  Sleep spindles Stage 3:  20% Delta Stage 4:  All Delta REM:  Alpha waves, eye  movements, “paradoxical  sleep”
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    A Typical Night’s Sleep
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    Why do we sleep? Sleep is necessary Links to immune functioning Restorative process Adenosine? Evolutionary:  Increases chance of  survival
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    Circadian Rhythm Circadian rhythm:  daily cycle of behavior and  physiology Physiology Body temperature Hormone release Urine production Mental activity General alertness Sensory processing Cognitive performance
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    Circadian Rhythm Two “peaks” in sleepiness One at night “bedtime” One in the early afternoon 
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    Circadian Rhythm External stimuli affect rhythm Eating, activities Example:  light and melatonin Eyes connected to SCN (suprachiasmatic nuclei in  hypothalamus) SCN activity inhibits pineal gland Pineal gland releases melatonin Melatonin: hormone associated with  sleepiness/relaxation
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    Circadian Rhythm 25-hour clock
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