Read a really charming and escapist novel. Worst case, you end up staying up too late because the book is so good, but I haven't found anything more reliable for making me disconnect from the world and its churning. Substituting a book for Twitter for the hour before bed has markedly improved the overall quality of my life.
To get yourself into the habit, don't read anything on your "to read someday list of important books." Just pick the most notorious page turner you can think of.