Class Notes (809,491)
Canada (493,752)
Psychology (2,034)
PSYCH 101 (695)

[FALL 2013 UW] PSYCH 101 - LEC 5

3 Pages
Unlock Document

University of Waterloo
Richard Ennis

(Lec. 5) Sleep: Periodic, natural, reversible loss of consciousness- as distinct from unconsciousness resulting from a coma, general anesthesia, or hibernation - Physiological: Heart rate slows down, breathing becomes more irregular, muscles relax, and sensory systems close down (starting with vision, then hearing, etc.) - Neurological: Electric voltage increases with more diffuse firings throughout the brain - Psychological: Awareness of time slips away, control of thought and imagery decreases, hypnagogic hallucinations may occur (strange occurrences that are experience just before nodding off) Circadian Rhythm: the biological clock; regular bodily rhythms that occur on a 24-hour cycle Sleep stages: REM sleep: otherwise known as, rapid eye movement sleep, a recurring sleep stage during which vivid dreams commonly occur. Also known as paradoxical sleep, because the muscles are relaxed, but other body systems are active Alpha waves: the relatively slow brain waves of a relaxed, awake state Delta waves: the large, slow brain waves associated with deep sleep Hallucinations: false sensory experiences such as seeing something in the absence of an external visual stimulus Why do we sleep? We need the rest and recovery time to be more replenished and active during the day. During sleep our levels of Serotonin and Norepinephrine drop and acetylcholine increases. Some effects of sleep loss consist of; increase in hunger, stress hormone (cortisol) which creates fat, and impaired concentration and productivity. Sleep theories… Why do we sleep? 1) Sleep protects – back in the hunter gatherer days, in order to avoid dangers of the night they would sleep through it 2) Sleep helps recuperate – it helps restore and repair brain tissue, sleeping gives resting neurons time to repair themselves 3) Sleep is for making memories – restoring and rebuilding our fading memories of the day’s experiences. 4) Sleep feeds creative thinking – On occasion dreams have inspired many artistic, literary, and even scientific achievements. A complete night’s sleep gives to our thinking and learning. 5) Sleep may play a role in the growth process – During deep sleep, the pituitary gland releases a growth hormone and we release less and less of this hormone as we spend less time in deep sleep (as we grow older) Sleep Disorders: Insomnia: recurring problems in falling or staying asleep Narcolepsy: a sleep disorder characterized by uncontrollable sleep attacks. The sufferer may lapse directly into REM sleep, often at inopportune times Sleep apnea: a sleep disorder characterized by temporary cessations of breathing during sleep and repeated momentary awakenings Night terrors: a sleep disorder characterized by high arousal and an appearance of being terrified; unlike nightmares, night terrors occur during stage 4 sleep, within two or three hours of falling asleep, and are seldom remembered. Dreams: a sequence of images, emotions, and thoughts passing through a sleeping person’s mind. Dreams are notable for their hallucinatory imagery, discontinuities, and incongruities, and for the dreamer’s delusional acceptance of the content and later difficulties remembering it. Manifest content: accordi
More Less

Related notes for PSYCH 101

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.