September 8, 2011 
Limited exposure to daylight causes difficult awakening in the morning, lack of concentration, and frequent mood swings that often lead to depression and anxiety…
The lack of daylight, especially in the right time of day, will upset the circadian rhythms of the body so that it is late or fast compared to the right time, experts have discovered. Therefore, the impact of daylight is extremely important in the fight with autumn depression. Due to changes in hours and lack of daylight, the body becomes tired, and mood swings become more frequent.This is caused by a naturally “tuned in” circadian rhythm, modeled by the first people who woke at dawn and went to sleep as soon as dark falls. Changing the hours to winter time, people get up while it is still dark outside, miss a good deal of daylight by staying indoors at work, and when it’s time to go home at 17 hours, the darkness falls again.
Because of that more than half of people have trouble waking up, a disorder of the biological clock, in addition to fatigue, affects kidney function and metabolism, a two-year U.S. study has established. Professor Till Roenneberg, who studies the influence of light on the human body suggests wearing sunglasses at around 16 hours. The best are the ones with blue effect for enhancing the daylight. Bright light stimulates the body to produce “awakening hormone” adrenaline, cortisol and serotonin.
Dim the lights in the evening
Lack of light encourages bad habits like smoking and drinking coffee to keep awake the body, experts say. Night trip to the bathroom so often has the same effect as a cup of coffee on the body. It is recommended to reduce the evening light in homes so as not to confuse the body, but prepare it to going to bed and good sleep.
Taken from: www.24sata.hr