Even if they're not paying attention it's likely a "this issue is not a me issue, I'm gonna re-read my notes or the summary memo for the next me issue" situatio

Even if they're not paying attention it's likely a "this issue is not a me issue, I'm gonna re-read my notes or the summary memo for the next me issue" situation. People don't generally slack of when a legislative body has a hearing. That's basically their "game day".