Checking in not only strengthens introspective awareness, but also allows you to correct for gross distraction before it causes forgetting. It’s like you’re intentionally shifting your attention to take a “snapshot” of the mind’s current activity to see if some distraction is about to make you forget. When you notice a gross distraction, tighten up attention on the breath to prevent forgetting. It may also help to take a moment to label the distraction before returning to the breath.