I read from screens all day: phone, tablet, desktop. I just finished reading The Martian on my phone. The only time I find I absolutely must have text on paper

I read from screens all day: phone, tablet, desktop. I just finished reading The Martian on my phone. The only time I find I absolutely must have text on paper is when I'm memorizing lines from a script for a play. I've even tried using flashcard software as well as audio I've recorded for my lines and cues; it doesn't work for me.