I had horrible pain in the muscles of the neck. Went to several doctors, had kinetheraphy and nothing changed. I then correlated it to a lack of sleep and now

I had horrible pain in the muscles of the neck. Went to several doctors, had kinetheraphy and nothing changed. I then correlated it to a lack of sleep and now see it as a pattern. In order to avoid confirmation bias, I tested my theory over a few years in various mental states (work, vacation, happy, sad, sporty, couch potato,...). The link was and is always there.