Screen Time is an app that comes preloaded on iPhones (or available with a system update) that tracks the time you spend on your phone on specific apps and how many times you pick it up. While Screen Time is specific to iPhone users, there are tons of similar apps available for Android or other operating systems (here are a few).
The app breaks out your screen time between different categories such as social networking, productivity, and other – allowing you to see how much time you spend on different apps. It will also show you the number of times you pick up your phone and the number of notifications you receive (from any app), both averaged by the hour.
Aside from showing you how much time you spend glued to your phone, it also provides some features to help combat this. You can set a downtime schedule where during those hours,