To have only half of what we feel we should have – for instance, perhaps only to have half of the food or drink we had expected – indicates that we are selling ourselves short. We are not allowing ourselves to have what we need.
To dream of being half way up a hill or a mountain or halfway down a river would indicate that there is some lack of motivation. We have made an initial effort but more is needed in order for us to be where we want to be.
To continually dream of slipping back, until we are only halfway through our task, to be repeating it over and over again, would indicate that we do not have the ability to complete it.
There is perhaps an extra skill that we need to enable us to achieve success.