Sleep and dreams

Question 1

circadian rhythms

Answer 1

biological clock (controlled by hypothalamus)
Provides approximate schedule for physical processes
(for example, of temperature and wakefulness) that occur on a 24-hour cycle.

Question 2

how does light affect the SCN?

Answer 2

Gets darker SCN tells pineal gland to secrete melatonin

Gets lighter SCN tells pineal gland to stop secreting melatonin

Question 3

REM Sleep

Answer 3

brain waves resemble wakefulness
Eyes move back and forth
Heart rate, blood pressure, breathing - rapid or irregular
Dreams
EEG looks as if they are awake-waves are active.

Question 4

N-REM 1

Answer 4

similar to drowsiness. Light sleep you can easily be awakened.

Question 5

N-REM 2

Answer 5

true sleep - reductions in heart rate and muscle tension
Brain waves are more relaxed.
Can be awakened by door opening.

Question 6

N-REM 3/4

Answer 6

deeply asleep, hard to awaken, disoriented when awakened

Growth hormones released from pituitary