What we find is the typical person checks their phone every 15 minutes or less and half of the time they check their phone there is no alert, no notification. It’s coming from inside their head telling them, “Gee, I haven’t check in Facebook in a while. I haven’t checked on this Twitter feed for a while. I wonder if somebody commented on my Instagram post.” That then generates cortisol and it starts to make you anxious. And eventually your goal is to get rid of that anxiety so you check in.