[AP] Warning: Looking at your smartphone while lying in bed at night could wreak havoc on your vision.Two women went temporarily blind from constantly checking their phones in the dark, say doctors who are now alerting others to the unusual phenomenon.The solution: Make sure to use both eyes when looking at your smartphone screen in the dark.
https://www.theguardian.com/technology/2016/jun/23/smartphone-users-temporarily-blinded-looking-screen-in-bed