Thursday, November 02, 2006

It is recommended that a bright light stimulus is needed to reset the body clock everyday recognising that this controls our daily sleep/ wake cycle and hormone functions. It uses signals from the sun and bright light to reset these functions, therefore in the winter months our bodies can receive these signals at the wrong time of day or not at all. By using a bright light, 10,000 lux, our bodies reset and the right hormones are released ensuring we feel active and energetic throughout the day with the need to sleep at night. Exposure to intense artificial light suppresses the secretion of the night time hormone melatonin, and may enhance the effectiveness of serotonin and other neurotransmitters. It is believed to be the only way of shifting the circadian rhythm. Research shows that the body’s internal clock only responds to bright light at certain times of day. This peak time in normal people occurs when the circadian rhythm is in R.E.M sleep, which is approximately 1 to 2 hours before waking.

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