Looking at bright screens at night can screw with our circadian rhythms. Our brains see the bright light and don't think it's late and we can have a hard time getting to sleep, etc....
You can install a small app on your Windows PC, Mac device or Linux box called f.lux that will automatically dim and change the color of your screen to a warmer color to help your eyes and brain adjust to thinking it's night. It's also nice to not have the harsh light on your eyes.
https://justgetflux.com/
Reduce Eye Strain and Get Better Sleep by Using f.lux on Your Computer
f.lux is cool because you tell it where you live and it will automatically determine what your sunrise and sunset times are and adjust the times throughout the year. I believe it also dynamically changes the brightness and darkness getting gradually darker and warmer as it gets later. I was told about f.lux about a year ago. Unfortunately, I can't use it because I have a USB display adapter and f.lux won't work with those (at least, not the one that I have).
This ability (not f.lux) is now (for 9.3) built into IOS, and it's called "Night Shift". You can have it set the times automatically by sunrise and sunset by your location as with f.lux or your can schedule the change by time. You can also adjust the warmth of the screen while in night shift mode. I do have it turned on for my phone and ipad and I like it.
How to Enable Night Shift On Your iPhone for Easy Nighttime Reading
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Steve
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