Yeah, the Paperwhite is not a backlit screen. The light shines down onto the page and reflects back, which is easier on the eyes. Basically the same as if you had a book light.

The newer one can do warmer light, too, but any Paperwhite is good enough.

But seriously try out that cognitive shuffle thing, it’s pretty amazing how well it works for me (as long as I’m tired; I haven’t really tried it when wide awake, that’s when I read).