On my PC and my phone there are ample opportunities for notifications. Some of them are system notification like charge levels, but most of them come via applications. One could get a notification for every email, every instant message. Browsers can now relay notifications from websites to the user. On the phone you have messages, calls, reminders.
In physics, there is a concept of a "mean free path length", system administrators know the "mean time between failures" (MTBF). The physics terms means the average length that gas atoms can move before they hit another gas atom. When there is a high density of gas atoms, this path length will be rather short. Only with sufficient dilution the length will be in order order of the container size.