Chapters 5.1a to 5.4b

Circadian Rhythm

Cyclical changes that occur on a roughly 24-hour basis in many biological processes

Biological Clock

Region in hypothalamus that is responsible for controlling alertness levels

How long does the average person sleep?

7 hours per night

How many stages of sleep are there?

There are 4 stages of sleep

Stage 1 Sleep Characteristics

Light stage of sleep (last 5-10 minutes); Characterized by theta waves; May experience hypnagogic imagery or myoclonic jerks

Stage 2 Sleep Characteristics

Characterized by sleep spindles and K complexes; Slowed heart rate; Lower body temperature; Muscle relaxation; Decreased eye movements; comprises up to 65% of sleep

K Complexes

Large peak of neural activity

Sleep Spindles

Small but frequent(?) bursts of neural activity

Stage 3 and 4 Characteristics

Begins after 10-30 minutes; Marks beginning of slow-wave or deep sleep; Children spend 40% of sleep in deep sleep; Adults spend 25%

When do delta waves occur in stages 3 and 4 of sleep?

In stage 3, delta waves occur 20-50% of the time; In stage 4, delta waves occur more than 50% of the time

Stage 5 (REM) Sleep Characteristics

High-frequency, low-amp waves; Increased heart rate + blood pressure; Irregular breathing; 20-25% of sleep

What are some examples sleep disorders?

Insomnia; Narcolepsy; Sleep Apnea; Night Terrors; Sleepwalking; Sexsomnia

Dream Protection Theory (Freud when I fucking get you)

Suggests that dreams exposed hidden wishes and desires by disguising sexual and aggressive impulses by transforming them into symbols

Aka just some Freud bullshit. come on

Manifest Content (Dream Protection Theory)

The dream itself

Latent Content (Dream Protection Theory)

Hidden meaning of the dream

Activation-Synthesis Theory