1.Bright light therapy for Circadian Rhythm Sleep Disorder
The principle of light therapy is to imitate bright sunlight and in turn tune the body clock. The light is provided through a Bright light box.
This therapy helps a person maintain a consistent circadian rhythm by sending a properly timed signal of light through the retina of the eye to the brain's suprachaismatic nucleus, or body clock in the hypothalamus Circadian rhythm disturbances respond very well to light therapy, especially bright light (>600 Lux). The timing of light therapy also is important as it affects the degree and direction of the rhythm shift. The modes of therapy for different disorders are:
Light therapy applied in the early evening and nighttime hours will delay the cycle for Advanced Circadian Rhythm Disorder (ACR)
In the early morning light therapy will stimulate morning alertness and an earlier bedtime for Delayed Circadian Rhythm Disorder (DCR). Bimodal Circadian Rhythm Disorder (BCR)
may cause a person to be awake during the night, so it is important to avoid light during the night. Use bright light in the mid morning, afternoon, late afternoon and evening while avoiding bright morning light before 9:00 am.
For sighted people, bright morning light should regulate Non 24-hour Sleep/Wake Cycle
symptoms or a free running circadian rhythm
Light therapy should always be used within the proper limits for intensity and time. Minor side effects
may include the following:
Eye irritation and dryness
Dryness of skin