Sleep Stages and their Characteristic Waves*

N1 produces this type of wave

theta wave

type of low frequency, low amplitude brain wave characteristic of the end of stage 1 sleep

theta wave

first stage of sleep; transitional phase that occurs between wakefulness and sleep; the period during which a person drifts off to sleep

stage 1 sleep

N2

stage 2 sleep

exhibits K-complex and spindles

stage 2 sleep

second stage of sleep; the body goes into deep relaxation; characterized by the appearance of sleep K-complex

stage 2 sleep

second stage of sleep; the body goes into deep relaxation; characterized by the appearance of sleep spindles

stage 2 sleep

third stage of sleep; deep sleep characterized by low frequency, high amplitude delta waves

stage 3 sleep

N1, N2, N3, N4, REM, N1 and the cycle repeats

False

fourth stage of sleep; deep sleep characterized by low frequency, high amplitude delta waves

stage 4 sleep

A __________ is an electroencephalography (EEG) waveform that occurs during stage 2 of NREM sleep. It is the "largest event in healthy human EEG". They are more frequent in the first sleep cycles.

K-complex

N2 produces this type of waveform

K-complex

N2 produces this type of wavefrom spindles along with ______

K-complex

complex that aids in sleep-based memory consolidation

K-complex

suppress cortical arousal in response to stimuli that the sleeping brain evaluates not to signal danger

K-complex

very high amplitude pattern of brain activity associated with stage 2 sleep that may occur in response to environmental stimuli

K-complex

NREM means

Non-REM sleep

rapid bursts of high frequency brain waves during stage 2 sleep that may be important for learning and memory

Spindles

N1, N2, N3, N4, REM, N2 and the cycle repeats

True

True or false? N1, N2, N3, N4

True

characteristic of still being awake. relaxed wakefullness produces this type of wave

alpha wave

relatively low frequency & relatively high amplitude brain wave

alpha wave

N3 produces this type of wave

delta wave

N4 produces this type of wave

delta wave

When you first fall asleep your brain activity resembles a dead person (exaggeration - low frequency - low amplitude) as you progress in the sleep cycle you exhibit ( low frequency high amplitude) waves.

delta wave

type of low frequency, high amplitude brain wave characteristic of stage 3 and stage 4.

delta wave

period of sleep outside periods of rapid eye movement (REM) sleep

non-REM (NREM)

period of sleep characterized by brain waves very SIMILIAR to those during wakefulness

rapid eye movement (REM) sleep

period of sleep characterized by darting movements of the eyes under closed eyelids

rapid eye movement (REM) sleep