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How smartphones and tablets affect your sleep
http://www.phonearena.com/news/How-smartph...r-sleep_id43857

Are you a smartphone owner and having trouble catching those ZZZZZs at night? You might have to blame the lack of sleep on your handset or tablet. According to the Rensselaer Polytechnic Institute in New York, exposure to the light from a tablet could drop the body's melatonin levels by 23%. For those who ironically slept through high school, melatonin is a naturally occurring substance in the human body that helps a person get to sleep by telling the body when it is dark and time for rest. The institute studied 13 volunteers aged 20 to see how a tablet placed by the bedside affected sleeping habits.

According to the Emory sleep disorders laboratory, you should refrain from using your tablet or phone before bedtime because the light from the tablet shines directly into your eyes. Even the famous Mayo Clinic got into the act last week by suggesting that tablet and phone users turn the light down on their slates before bedtime. The Clinic said that devices emitting more than 30 lux in light can affect melatonin levels in the body.