Sleep and Dreams

Question 1

Circadian rhythm

Answer 1

• biological clock (controlled by hypothalamus).

- Provides approximate schedule for physical processes

Question 2

Suprachiasmatic nucleus (SCN)

Answer 2

(in hypothalamus) sensitive to changes in light

Question 3

How does the Suprachiasmatic nucleus (SCN) react to little light?

Answer 3

SCN tells pineal gland to secrete melatonin

Question 4

How does the Suprachiasmatic nucleus (SCN) react to more light?

Answer 4

SCN tells pineal gland to stop secreting melatonin

Question 5

What is Rapid eye movement (REM) Sleep

Answer 5

• “Paradoxical sleep”
• Eyes move back and forth
• Heart rate, blood pressure, breathing – rapid or irregular
• Dreams
• Sleep paralysis

Question 6

Stage 1 of N-REM

Answer 6

• similar to drowsiness
• Hypnic or hypnagogic jerk
• Hypnagogic hallucinations

Question 7

Stage 2 of N-REM

Answer 7

– true sleep – reductions in heart rate and muscle tension

Question 8

Stage 3/4 of N-REM

Answer 8

• deeply asleep, hard to awaken, disoriented when awakened

- Growth hormones released from pituitary