My team has a meeting to hand off the on-call to the next person, and we discuss all pages we got during the week. Primarily two things: whether the page was for a good reason or not (good: our on-call person had an something actionable to fix. bad: non-actionable pages, pages because someone else's system was broken, false alarms, etc), and also whether there is something we can do so we never get paged for this again. I find it very effective at reducing pages.