Looking at an email at 1:00am and having your eyes crawl back into your brain is exactly why implementing night-mode is a great thing to do for your users. Not only that, there are benefits for battery when your user’s device is running an OLED panel!

If you are at the start of implementing night mode, I’d suggesting reading the following article, by Chris Banes, to give you some context and a quick run-through of what you need to do!

https://medium.com/androiddevelopers/appcompat-v23-2-daynight-d10f90c83e94

You can also take a look at a basic example at the following Github repo: https://github.com/wdziemia/Nightmode