There is evidence to suggest that using a screen right before bed may disrupt your sleep. One theory is that the blue light emitted by these devices may prevent the release of melatonin, a hormone that helps the body recognize when it is time to go to sleep. Another element is the information visible on the screen. If you watch a scary movie, read an article that makes you feel strongly about anything, or consume any other anxiety-inducing media on your screen, it may be difficult to fall asleep. Sleep experts advise turning off all screens at least one hour before night and replacing them with a relaxing pastime like light reading.