After i changed my phone screen to a blue-cutting eed filter and use the smallest usable light for what i want to do in the night my sleep quality has been improved.
f.lux > sleep research: https://justgetflux.com/research.html
How does blue light blocking compare to breathing patterns for sleep and exercising at least an hour before bed and sugar and animal protein restriction after dinner?
Sleep hygiene: https://en.wikipedia.org/wiki/Sleep_hygiene