By now, you've probably heard about the various studies that say you should shut down your electronics an hour before bedtime.

Even if you disregard this wisdom and lie in bed endlessly scrolling through cute cat pics on Instagram, or find yourself sucked into the latest idiocy on Twitter (Twittdiocy?), you're no doubt aware that the blue light emanating from your phone is not good for you, as evidenced by eye strain or an ever-later sleep time.

We all know we should put down the phone and shut off the computer—and we all mostly ignore this advice. But if vague warnings aren't convincing you, maybe what it will take is a closer look at what's going on in your body when you keep your phone on too late.

Sleep and melatonin

You can sleep during the