Your internal clock, or circadian rhythm, is closely connected to many forms of insomnia. Contrary to popular belief, circadian rhythm has more to do with the levels of light than the time of day. This internal clock is what tells us when to go to sleep, and when to wake up in thew morning.
The circadian rhythm IS the internal clock.These rhythms are to some degree governed by hormones secreted by endocrine glands throughout the day. And our body temperature and overall mental acuity and alertness are only some of the factors affected by the circadian rhythm.
Our circadian rhythms are partially responsible for us having lots of energy during some parts of the day yet feeling sluggish and tired at other times of the day. Many people who have a sleep disorder related to their circadian rhythm tend to feel tired when they should be wide awake. People who work at night or keep odd hours are the most common sufferers of this type of sleep disorder.
Light, as in bright natural sun light, is one of the largest factors of regulating your circadian rhythm. Not getting enough light for extended periods of time can cause low energy and fatigue. Those in northern climates can readily see this towards the end of the winter.
Correcting sleep disorders caused by, or related to, your circadian rhythm can be done by light therapy specially designed to slowly reset your circadian rhythm. The light is delivered from what is called a “light box” which has the correct wavelengths of light. 30-60 minutes of exposure to the light in conjunction with a strict sleep schedule explains the therapy.
The key to success with light therapy is to time the light exposure correctly depending on your particular situation.