Have you got a smartphone addiction? Even if you think the answer is no, you might still be shocked by the results from QualityTime - My Digital Diet.
The app records how long you use your phone for each day, as well as tracking the use of each individual app. You can then check out well presented summary charts for each day and week.
If you're got an addiction you can set the 'take a break' option, which stops you using your apps. It was so effective I had to uninstall it to use my phone again!