Twilight is an app whose main goal is to help you sleep better. It’s especially aimed at people with insomnia and based on the theory that exposure to blue light right before going to bed can disturb natural sleep rhythms, causing sleep problems. Again, keep in mind that this is just a theory and is not scientifically proven.
Most importantly it also works on the Oculus Go cause it supports android TV and the change of screen color will persist even when launching other applications or games.
You’ll need to sideload this APK to install this on your Go device. Plus you’ll have to launch it with Oculus TV app.