How to dim your PC or tablet/phone screen
You can ether manually or automatically dim your screen for different times of day.
For your own equipment, you can install free software that changes both the colour and brightness throughout the day, just like our lighting does. See f.lux
This article goes through how to manually and automatically adjust the brightness of your windows PC.
Apple devices including phones, tablets and laptops have a ready go setting that supports circadian lighting called “Night Shift Mode” – you just need to set up your times of day. Find out how to use it here.