Useful sunlight to help produce vitamin D in our body . It is a vitamin which is also useful for producing and strengthening bones . Here are some facts why we need sunlight as quoted by WebMD.1 . Our bodies , our eyes also , takes 15 to 20 minutes in the sun without sunglasses with sunscreen every day for the skin to produce vitamin D.2 . Most of sunscreens only protect against the adverse effects of ultra violet B rays ( UVB ) . Excessive use of anti - UVB sunscreens can actually interfere with the production of vitamin D. Interfere with the absorption of the glass and the window full spectrum of sunlight .3 . When natural light is absorbed by the retina of the eye , electrical impulses carried by the optical nerve to the brain , and the hypothalamus , pineal gland , and pituitary gland . From here neurotransmitter that activates the body turning on hormone systems , including metabolism , reproductive function , and also in the body 's biological clock called the circadian rhythm .4 . Circadian rhythm of the body is activated by a brighter light and a complex spectrum than that required by the visual work . NASA space agency put the full spectrum of light in space flight numbers for this purpose .5 . Exposure to light increases serotonin , a substance that keeps you awake and alert .6 . Increased melatonin levels in the dark that makes you sleepy . This substance is suppressed by light . If you do not get enough light intensity , you produce too much melatonin, which makes you feel dizzy . So , if you are tired during the day , maybe you should get out a bit and sun exposure . So , what should we do?7 . Sun bathing outdoors without sunglasses with sunscreen for 20 minutes every day . Through your eyes , the light is taken directly to the hypothalamus and from there carried to every cell in your body . This will help the skin to produce vitamin D , an important vitamin for bone .8 . Try eating lunch outdoors . You do not need direct sunlight , eat on the patio .9 . Try reading the morning newspaper or magazine under the sun exposure .10 . If you can not be outdoors for a variety of reasons , including living in a big city , try to sit near the window open for 20 minutes every day to enjoy the sunshine .
