Habit: Usually rocking is a habit...Once in a while it can be a biochemical imbalance in the brain that is either the body trunk's equivalent to a tremor in the arm or even a 'tic'...Which makes us feel 'good' to do and hard to stop ourselves from doing. Also even rarer would be a problem in the coordination center of the brain...Cerebellum.
Answered 9/28/2016
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