Sleep & Dreams- Sleep cycle

Question 1

Describe stage one of the sleep cycle.

Answer 1

Drowsiness, the person can be awakened with out much difficulty, may feel like they haven’t slept at all.

Question 2

Describe stage 2 of the sleep cycle.

Answer 2

Light sleep, spontaneous periods of muscle relaxation/muscle tightening. Heart rate slows and body temperature decreases.

Question 3

Describe sleep stages 3 and 4 of the sleep cycle.

Answer 3

These stages are deep sleep stages, stage 4 is more intense than stage 3. Known as slow wave or delta sleep.

Question 4

Describe stage 5 of the sleep cycle.

Answer 4

This stage is REM sleep, when intense dreaming occurs. Heightened cerebral activity occurs but paralysis occurs in the main muscle groups throughout the body.

Question 5

What stages are non-REM sleep and what stages are REM sleep?

Answer 5

Stages 1-4 = Non-REM sleep

Stage 5 = REM sleep