Exam 2 Flashcards
Stages of Sleep
Alpha waves
Stages 1 & 2
Delta waves:
Stages 3 & 4
REM sleep
Alpha waves
Awake; low voltage, high frequency
Delta waves
High amplitude, low frequency
Stages 1 and 2
NonREM
Frequency slows, amplitude increases
Muscle activity, heart rate, and body temperature increase
Stages 3 and 4
MOST RESTORATIVE STAGE
Deep sleep
Deep, rhythmic breathing
REM Sleep
Awake-like EEG
Dreams, skeletal muscle paralysis
How much do we dream?
2 hours per night
How many cycles of sleep do we go through a night?
4 to 5 per night, lasting 90 to 110 each
How much sleep do we need?
Childhood: 14 to 17 hours
Adolescence: 8 to 10 hours
Adulthood: 7 to 9 hours
Brain Elasticity Theory
Sleep is correlated to changes in structure and organization of the brain
Restorative Theories
Sleep helps restore, repair, and rejuvenate
Adenosine Theory
Buildup of adenosine causes us to feel tired
Sleeping clears this buildup
Adaptive/Evolutionary Theory
Inactivity helps us survive by keeping us out of harm’s way while particularly vulnerable
Energy Conservation Theory
Sleep reduces energy demand and expenditure
Sleep deprivation consequences
Irritability, apathy, disinhibition
Flattened emotional responses
Major Depressive Disorder
Can’t multitask or concentrate
Increased blood pressure, diabetes, obesity
Reduced brain volume
Insomnia
Prevalence: 10-15% of all adults
Inability to fall or stay asleep
Doubling of mortality rate
Narcolepsy
Extreme tendency to fall asleep in relaxing surroundings
How to improve sleep?
Pharmatherapy (serious side effects)
Chronobiological (bright lights)
CBT
Stimulus control
Sleep hygiene and restriction
What is a stressor?
Any event that evokes a stress reaction
Four types of stress
Biochemical - release of hormones
Physiological - blood pressure
Cognitive - beliefs about the stressor
Behavioral - flight or fight
Sources of stress
Early life experiences
Chronic stressful conditions
Workplace stress
Characteristics of a stressor
Negative
Uncontrollable
Unpredictable
Ambiguous
Overload
Two types of cognitive reactions to stressors
Appraisals: what is going on?
Anticipations: anxiety
Mobilizing response
Flight, fight, or freeze
Affiliative response
Tend and befriend
General Adaptation Syndrome
Alarm: immediate reaction
Resistance: adaptation to the stressor
Exhaustion: breakdown of adaptation