Sleep is composed of several different stages that can be differentiated from one another by the patterns of brain wave activity that occur during each stage.

• True

• False

Changes in brain wave activity can be visualized using

• ABC

• KFC

• MRI

• EEG

characterized by darting movements of the eyes under closed eyelids. Brain waves appear very similar to brain waves during wakefulness.

• REM

• Non-REM

...subdivided into four stages distinguished from each other and from wakefulness by characteristic patterns of brain waves.

• REM

• NREM (non-REM)

The first four stages of sleep are NREM sleep, while the fifth and final stage of sleep is REM sleep.

• True

• False

During this stage of sleep the body goes into a state of deep relaxation. Important to learning and memory

• NREM stage 1

• NREM stage 2

• NREM stage 3

• NREM stage 4

During this stage of sleep the pattern of brain wave activity resembles that of someone who is very relaxed, yet awake. It is relatively easy to wake someone during this stage/

• NREM stage 1

• NREM stage 2

• NREM stage 3

• NREM stage 4

often referred to as deep sleep or slow-wave sleep

• NREM stages 1 and 2

• NREM stages 3 and 4

• NREM stages 2 and 3

• NREM stage 4

...this is the period of sleep in which dreaming occurs.

• NREM stage 1

• NREM stage 3

• REM

The meaning of dreams varies across different cultures and periods of time.

• True

• False