Do you follow the advice to turn off blue light on your screen or just stop using screens before bedtime?

I tried this on my tablet last night for the first time, with a timed setting. Everything went strangely red, yellow, and brown. Not a good time to be shopping for anything you pick by color, but otherwise I got used to it fairly fast.

Have you done this? Notice any difference in your quality of sleep or how quickly you fall asleep?