Read or write something for yourself every day. Some people like to get in bed and read every night, and others like to keep a journal. Either way, it's a great way to decompress, to give your brain some space between the active part of your day and your sleep. No, TV doesn't count as complete downtime for your brain. Studies show that, for optimal sleep, you want at least 30 minutes to 1 hour off a screen before bed.
So, “What about my kindle or my tablet?” I hear you ask. While it's not ideal, it's better than nothing at all. But just as a test, see what happens if you re-familiarize yourself with words on an actual page of paper. It may be old-fashioned, but perhaps we don't need to get rid of all that came before the year 2000!