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Biological Rhythms and the Body Clock Part I:
The Basis of Light Therapy for Sleep Disorders

In all mammals, including humans, there is a "body clock" in the brain that coordinates the daily (circadian) rhythms that the body experiences throughout the day. These rhythms include the cycle of waking and sleeping, the rise and fall of blood pressure and heart rate, and daily rhythms of gastrointestinal, renal, and immune system activity.

The body clock aligns its timing to the external environment through exposure to light. In mammals the pathway through which the environmental light signal enters the brain originates in the retina of the eye. While this pathway evolved to be sensitive to sunlight, artificial light of an appropriate form can also be used. With the normal polychromatic (white) light normally used for indoor lighting, very high intensities of light are needed to regulate human circadian rhythms.

Light therapy can be used to correct sleep phase disorders, which occur when a person's internal biological clock is delayed or advanced from the external environment. People with Delayed Sleep Phase Syndrome (DSPS), which often begins at a young age, find it difficult to fall asleep until the early morning hours. See Refs

People with Advanced Sleep Phase Syndrome (ASPS), which often starts in older people, tend to become tired in the late afternoon or early evening, and then find themselves wide awake in the middle of the night. Read more on aging, and how this can affect the body clock.

For people with a delayed circadian rhythm, the internal biological clock can often be shifted to an earlier position and aligned with the external environment through exposure to appropriately timed light therapy in the morning. Similarly, for people whose internal clocks are set too early, the internal clock can be often shifted to a later position with evening light therapy. See Refs However, the timing of light treatment with respect to the position of the internal clock is critical. People with delayed or advanced sleep phase syndromes would be well advised to consult with a qualified sleep therapist before embarking on a program of light therapy.

The insight by Sunnex Biotechnologies scientists 2 decades ago that wavelength is as important as intensity for shifting the body clock has now been confirmed by research groups around the world. Independent university and military laboratories have also confirmed that the most efficient wavelengths for shifting the body clock are provided by the patented Sunnex Biotechnologies low-intensity GreenLIGHT technology used in Lo-LIGHT therapy lamps. More information on why the low-intensity Lo-LIGHT is as effective as bright light therapy

The patented Lo-LIGHT technology comfortably shifts the internal body clock as effectively as bright white light. Lo-LIGHT lamps screen out the hazardous wavelengths of blue visible light. The Lo-LIGHT can therefore be used by people whose conditions make them sensitive to eye damage. This includes people with pre-existing ocular conditions, those with diabetes or other diseases that predispose them to retinal damage, and those taking photosensitizing medications, or herbal supplements like St Johns Wort.

PART II:  Seasonal Changes, Light Exposure, The Body Clock, and SAD.

NOTE:Studies at university and military research centers have shown that low-intensity GreenLIGHT technology is also useful for helping people adapt to working the night shift.
Please see
The GreenLIGHT System Fatigue Counter-Measures for Night Shift Workers.


patent

Purchase or "No Risk" Rental Plans

In North America, a no-risk rental program is available on some models. If the unit is purchased within 2 months from the time of rental, all rental payments are applied towards the purchase price. Order Now!

The Sunnex Biotechnologies Lo-LIGHT phototherapy lamp comes with a five year warranty. Details