I get so frustrated when this topic comes up. If you have an OLED phone running Android, you can get cf.lumen and use it to turn all blue light off. This uses

I get so frustrated when this topic comes up. If you have an OLED phone running Android, you can get cf.lumen and use it to turn all blue light off. This uses only red light and preserves night vision and eliminates eye strain. That alone should give intuitive evidence that maybe blue light actually is a danger to our eyes and to our sleep. But as usual, the phone developer DONT GET IT and continue to not offer this feature as a default even though any OLED can do it.