Why can't I sleep even though I'm tired?

[rexlinemouliya]

It affects your brain, body and hormones, helping you stay awake and telling your body when it's time to sleep. Natural sunlight or bright light during the day helps keep your circadian rhythm healthy. This improves daytime energy, as well as nighttime sleep quality and duration. In people with insomnia, daytime bright light exposure improved sleep quality and duration. It also reduced the time it took to fall asleep by 83%. A similar study in older adults found that two hours of bright light exposure during the day increased the amount of sleep by two hours and sleep efficiency by 80%. While most research is in people with severe sleep issues, daily light exposure will most likely help you even if you experience average sleep.

http://www.youtube.com/watch?v=LlW73Be-J_A