Shining a light in your eyes (the basis of many a type of screen) isn't, though. It can muck with your circadian rhythm (that is the basis of bright light ther

Shining a light in your eyes (the basis of many a type of screen) isn't, though. It can muck with your circadian rhythm (that is the basis of bright light therapy). There are some timer programs that automate turning down screen brightness in the evening..