We have tinted windows and it's not enough for me. I keep telling my husband that I have skinny eye lides. Morning sun always wakes me up. If you're bothered by light, you may have to add something to block the light.
less effort than blackout fabric - silver/foil windshield sun shades (the kind sold by Crappy Tire) are approximately the right size for all the back windows of a 17'. Stick on velcro on the window frame and on the sun shade, use at least 1" pieces.