Hello Yoga-Yoda,
Yes pratyahara is a natural result from meditation. Basically it means that the senses are no longer distracted by the outside world. While you could practice to keep attention inward and shut out all outer sense perceptions, you will be better off revising your interests. I find that concentration practices in general are arduous phenomena if your primary interest is not in the object or subject of concentration.
Therefore I will have to say: Try to develop an most honest and dedicated interest into your inner self, into awareness. If your interest in this peaceful state of awareness becomes greater than your interest in the outer phenomena and sense perceptions, pratyahara is naturally attained. It is all about what you belief is wordt most to you. if you still think you can get something out of chasing after desires and external factors, than your attention will be scattered and concentration is near impossible to bring you to peace.
If on the other hand your inner beingness, your peace of mind seems to be the only real happiness to you, you will no longer be disturbed by any of these sense perceptions. you have realized they are just that and that they cannot give you lasting satisfaction.
Love,
Bentinho