How do you stop your pony napping?

Since the question is in reference to an undesirable behaviour where the horse is suddenly refusing to go forward (not sleeping), there may be several reasons why he is acting up like this: The horse may be experiencing pain under saddle (which is the number one cause of napping), or it may be scared or over-faced. Have an equine vet check the horse for back or dental pains. If these are ruled out try retraining the horse to be more confident going forward. This may mean retraining from the ground up, if necessary.