REM sleep

Stage 1

Stage 2

Stage 3

Stage 4

All of these

Intense dreams

Quickened heart rate

Quickened breathing

Voluntary movement of the eyes

Vivid dreams

Random movement of the eyes

Low muscle tone throughout the body

Less control over breathing

Stage 4

REM Sleep

Stage 2

Stage 1

Stage 3

REM sleep

Stage 1 sleep

Stage 2 sleep

Stage 4 sleep

Memory consolidation and synaptic pruning

Slow waves on EEG readings

Transition between sleep and wakefulness

Deep sleep

Vivid dreams

Light sleep phase, during which a drop in body temperature occurs

5-10 minute phase, during which we can be easily awakened

Phase 2 sleep happens 90 minutes after you fall asleep and corresponds to deep, resorative REM sleep

None of these

Blood pressure, metabolism, and body temperature

Heart, intestinal, and skin health

Hair and skin health, weight, and muscle restoration

Mental functioning, hormones, and physical fitness

Slow wave sleep, or non-rapid-eye-movement sleep

An extreme emotion, such as anger or sadness, occurring at the time of the reading

A painful sensation experienced during the reading

The accessing of spatial information

The subject is working through a problem involving math

All of these

Obesity

Impaired immune functioning

Diabetes