Stages of Sleep

Question 1

NREM 1

Answer 1

The stage between wakefulness and sleep. Muscles are still quite active and eyes may open and close from time to time.

Question 2

NREM 2

Answer 2

First unequivocal stage of sleep. Muscles become less active and conscious brain activity ceases.

Question 3

NREM 3

Answer 3

Deep delta wave sleep. The sleeper is less responsive to the outside world. Dreaming is more common in this stage of sleep.

Question 4

REM

Answer 4

Occurs in cycles of 90-120 minutes throughout the night. Rapid eye motion, Breathing is more rapid, and heart rate increases closer to waking.

Question 5

Sleep spindles

Answer 5

during stage 2 sleep. Sleep spindles are generated in the reticular nucleus of the thalamus. the brain is inhibiting processing.

Question 6

K complex

Answer 6

Brief electrical activity in the brain seen in stage 2 sleep. aid in memory consolidation.