Your Eyes and the Sun.

Light tells the brain it is time to wake up. But did you know that exposure to in the early morning, can actually help you sleep at night. The timing of exposure is crucial; the body clock is most responsive to sunlight in the early morning, between 6 and 8:30 a.m. Exposure to sunlight later does not provide the same benefit. The type of light also matters, as does the length of exposure. Direct sunlight outdoors for at least one-half hour produces the most benefit. HOWEVER, Overexposure to the sun's ultraviolet (UV) radiation can cause a variety of eye problems, including cataracts, macular degeneration, non-cancerous growths on the surface of the eye) and even cancer of the eye and eyelids. Therefore, to protect your eyes from harmful solar radiation you should ALWAYS wear sunglasses when you are outdoors except when you are getting that early morning light. AND never look directly at the sun.