Earlier quoted context omitted.
You need to tighten up your standups. Each person should be saying what they did yesterday, what they're going to do today, and identify any dependencies or blockers. It's important for everyone on the team to know what others are doing in order to share knowledge. If people are zoning out, you're not getting that benefit.
Yes but either you don't know what they're talking about (different part of the project), or already know what they're talking about (because you are a tight team). So, zone out. Who's the Punch and Judy show for?
Additionally, we use it as a chance to bring up anything we need help with, or anything we found interesting in the last day, which wasn't important enough to interrupt the rest of the team with.