One of my students is an EMT and is often driving around--listening is easier for him than reading. Others find it's hard to keep all the characters and information in their head without a voice giving rhetorical life and inflection to the prose. Others read while they listen. But mostly, I think it's increasingly difficult for students to get real quiet mental space away from distractions to read. I know it's hard for me. They're excited by it when it's happening but it's hard to schedule time.