Some nights, when I lay on my bed trying to sleep but my mind is still racing, I try to calm down by counting or something that requires concentration in order to forget everything else. I noticed how I cannot count without having another train of thought talking or replaying a song I was listening to the same day. It's like having two threads running in parallel.

Trying to count visually is almost impossible, I lose track before reaching twenty. As a friend of mine put this, “I can't count sheep to sleep because they are always cheating.”