Circadian dysrhythmia

Other Names:
Disturbed body clock
Jet lag

Circadian rhythms control the sleep-wake cycle, mainly via exposure of the body to light. The circadian clock resets itself once a day, triggered by daylight. In some people, the clock does not reset properly, yielding winter depression, or seasonal affective disorder (SAD).


Our society now has a ready supply of light at any hour of the day. Working in the evening has shifted the clocks of some people by 4-5 hours, which means that they must incur a sleep debt the next day when they are forced to wake up early.

Narrower Problems:
Seasonal affective disorder
Related Problems:
Sleep-wake schedule disorder
Related UN Sustainable Development Goals:
GOAL 3: Good Health and Well-being
Problem Type:
G: Very specific problems
Date of last update
11.10.2019 – 17:32 CEST