4.1.5 (7B) - circadian rhythm sleep disorders

Question 1

Sleep disorders

Answer 1

Disturbances to typical sleeping + waking patterns - results in sleep deprivation.

Question 2

Circadian rhythm sleep disorders

Answer 2

Sleep disorders that interfere with the typical regulation of the circadian rhythm of sleep, leading to a change in the sleep-wake cycle.

Question 3

Delayed sleep phase syndrome (DSPS)

Answer 3

Type of circadian rhythm sleep disorder where sleep + waking occur later than usual.

Question 4

Advanced sleep phase disorder (ASPD)

Answer 4

Type of circadian rhythm sleep disorder in which sleeping + waking occur earlier than usual.

Question 5

Shift work

Answer 5

Occupation that involves working unusual hours such as overnight or rotating roster (eg. nurse, hospitality, etc).

Question 6

Treatment - bright light therapy (BLT)

Answer 6

Method used to adjust a person’s circadian rhythm through exposure to high-intensity light source.

Question 7

Factors essential to BLT

Answer 7

• Appropriate timing of exposure.
• Right amount of light.
• Safe exposure.

Question 8

BLT as treatment

Answer 8

DSPS - exposed to light in morning - help melatonin release earlier.
ASPD - exposed to light at night/when feeling sleepy - help melatonin released later.
Shift work - depends but common to be exposed before beginning shift to promote wakefulness + cease melatonin release.