Could be residual energy build up in the body. It hasn't let go from all the tension an anxiety yet. It has happened with my oldest too. Poor girl ![Sad :(](http://www.intensitysquared.com/Smileys/default/sad.gif)
Makes sense. She was sick and tensed, so walking or biking tension away was no option. I used to massage her before bed, when she was tensed. But, she severely bruised her shoulder a while ago, all seven attached muscles afflicted big time. Massaging was not an option.
But, she is healing, maybe I can massage her soon again.