What's keeping you awake at night?

There’s nothing worse than not being able to fall asleep at night. You toss and turn, fluffing one pillow and then another. Blankets on, blankets off. Window open, window closed. Nothing seems to be right. Thoughts about the previous day and the impending dawn tumble through your head, swirling around, popping up, flitting away – teasing you and flirting with your subconscious.

Exasperated, you give up on sleep and open up your laptop to check Facebook, or pull up the latest round of Candy Crush on your phone, hoping the mind-numbing scrolling will finally hypnotize you into sleep.

But what if these LED screens are exactly what’s keeping you awake?