Around a month ago, I started using f.lux on both my laptop and desktop computers. It is a little app that makes the colour of your computer screen adapt to the time of day. It controls the amount of blue light that your computer screen emits. All you have to do is pick the amount of lighting you have at night and during the day, as well as where in the world you live, so f.lux can adjust your lighting according to sunrise and sunset. These are my f.lux preferences at the moment:
I’ve found that the app works very well, even though sometimes the colours seem a little distorted from what I’m used to. Try f.lux by downloading it here. It is available for Mac, Windows, Linux as well as for iPhone/iPad.