Do you spend too much time at your computer, sometimes working at first light and again at midnight? The harsh glare of a computer screen may make your eyes tired and mess up your brain’s view of day and night.

F.lux is a tiny little download that helps change the glow of your computer based on the time of day. Just install the executable, put in your time zone and let F.lux do its thing. It will help your screen mimic the light in the room you’re in, thus relieving your tired eyes. My fabulous assistant, Claire, loves it.

F.lux: control your screen brightness settings automatically.

Want more ergonomic aid? Check out this tool that takes you through a 15-minute ergonomic questionnaire.