If you are interested in something, you will remember it. Likewise, if you are not interested in something, you will forget it. Wherever your interest, purpose and intention are, that is what receives the life force, or prana.
In our daily life, this principle can be applied to whether or not we remember where we put our keys. If we are paying attention when we are setting the keys down, we will remember where we put them. This is the principle behind prana pratishtha. The act of paying attention and the intensity of interest is what brings something to life. Wherever your prana or attention goes, automatically your mind goes there. So yoga teaches us to gather the scattered forces of our mind, and direct them to a focal point in order to hold our awareness here to awaken the dormant powers within us.