I once met a man who said that he can never have just one bowl of soup. He always wants a second bowl, regardless of the amount in the bowl. He became known for this habit. One of his relatives served him a very large bowl of soup as a test. He finished it and then asked for another.
All of us follow routines, far more than we may realize. I like to read just before going to sleep. Nothing thrilling that will jangle the nerves. No business books that will spur me to take notes. The book can be humorous or serious but it can't be so deep that fatigue will fog clarity.
I'm currently re-reading Catch-22. Not a bad choice. A sample:
Major Major had been born too late and too mediocre. Some men are born mediocre, some men achieve mediocrity, and some men have mediocrity thrust upon them. With Major Major it had been all three. Even among men lacking all distinction he inevitably stood out as a man lacking more distinction than all the rest, and people who met him were always impressed by how unimpressive he was.
[Update: Correction was made in second sentence. Mea culpa.]