We had the night mode feature on the previous OS version. Does it still exist after the newest updates? I'm using a Moto G 2nd Gen btw. And i have Android M on it.
Not sure about moto, I don't have it on S7 or S6, but I use Nova launcher and that has. When I chat on whatsapp etc, I do the negative screen thing to calm the light down at night.... Hope it's on android N!