I am dealing with a mild hamstring injury on the left leg. One of the things that makes it bother me (not bad pain, maybe a 1 or 2) is tensing the muscles on the back of the leg and buttocks. So... I don't do that--except when I'm asleep. For some weird reason I point my toes to the extreme and tense my leg muscles when I am asleep! I have done this for years and a few years ago it caused me some achilles problems due to the toe pointing and the compressing of the achillles tendon. Now my hamstring, which is much better, is affected more by what I do during my sleep than it is by riding. How can I stop, and what makes some people do this? My sister has the same problem.