I was very sick as a child: asthma, neurodermitis, a lot of allergies etc. At one point when I was 8 or so I thought that it really sucks that I have to be careful about how, when and where to play, run etc. so I decided to ignore all my symptoms until they get too bad to ignore. I also started to shower cold (or rather: end every shower cold). And i "taught myself" to sleep without a blanket. It really just feels we…
Addendum: I think I learned something like autogenous training that way. There are times in winter when it's really cold (10 Fahrenheit or so) and I start shaking. Then I think about it and "just" stop cramping and instead "relax into the cold". Then suddenly I'm warm :)
doing that is one of my first memories. i realized i could just let myself be cold.