#9.2 Stages of Sleep

frequency

BRAIN ACTIVITY < parts of wave:

numbers of waves per second

amplitude

BRAIN ACTIVITY < parts of wave:

heights - index of strength

wakefulness

state where high frequency brain waves (beta waves) are dominant

sleep

(general) decrease in frequency and increase in amplitude

beta waves

BRAIN WAVES < types:

high frequency, low amplitude

alpha waves

BRAIN WAVES < types:

slower frequency, higher amplitude

theta waves

BRAIN WAVES < types:

low frequency, low amplitude

delta waves

BRAIN WAVES < types:

low frequency, high amplitude

drowsy

state where alpha waves are dominant

rapid eye movement

REM AKA (abbreviation)

paradoxical sleep

REM AKA

REM

STAGES:

deep sleep in some ways and light in others + level of arousal

REM

STAGES:

eyes dart back and forth beneath our eyelids

NREM Stage 1

STAGES:

Lasts for 5-10mins on average

NREM Stage 1

STAGES:

Slow transition from alpha to theta waves, heart rate and muscle tension start to slow down

NREM Stage 1

STAGES:

Myoclonia (muscle jerking)

NREM Stage 1

STAGES:

May have hypnagogic state

NREM Stage 2

STAGES:

brain senses, but inhibits the stimuli if it's not important (brain inhibits CORTICAL ACTIVITY during sleep)

NREM Stage 2

STAGES:

Brain waves of medium amplitude, heart rate and muscle tension continue to drop

NREM Stage 2

STAGES:

has sleep spindles (brief burst of activity)

sleep spindles

May represent brain's attempt to keep us sleeping while keeping eye on the outside world

NREM Stage 3-4

STAGES:

delta waves, which are strong but slow waves = deep sleep

NREM Stage 4

STAGES:

deep sleep stage that has higher amplitude (mostly DELTA waves)

NREM Stage 4

STAGES:

awakening a person in this stage is challenging, and person when awoken becomes very confused

REM

STAGES:

Increased in neuronal activity similar to stage 1 except for eye movements

REM

STAGES:

Brain Inactivity - postural muscles are relaxed

REM

STAGES:

Brain Activity - High activity in the Pons, Limbic System (emotion), and visual association areas, but low activity in the primary visual cortex (V1)

5

Average person has ___ REM episodes in 8hrs of sleeps spaced out roughly 90 minutes.

S-2-REM-2-S

After about 60-90 minutes, we cycle back _________