Circadian rhythm disorders involve problems with the timing of sleep and wakefulness caused by issues with the body's master circadian clock located in the brain. One type is an extrinsic circadian rhythm disorder called shift work disorder which affects those who work night shifts.

1. SLEEP RELATED
HYPOVENTILATION

10. CIRCADIAN RHYTHM DISORDER
• Circadian rhythm disorders all involve a problem in
the timing of when a person sleeps and is awake.
• The human body has a master circadian clock in a
control centre of the brain known as the
suprachiasmatic nucleus(SCN).

20. Extrinsic circadian rhythm disorder
• Shift work disorder