In the Zhuangzi (Taoist text), Zhuang Zhou wrote he dreamed he was a butterfly. When he woke up he did not know whether he was perhaps a butterfly dreaming he is a man. (Wikipedia)
Personally, I never dreamed of being another creature. When I remember a dream I had, the memories are always as if I experienced it. This makes me wonder whether it is actually possible to dream your self is something substantively other than self. By this, I do not mean dreaming something impossible, like flying. I mean an actual other self, like another person or an animal, i.e. a butterfly.
This makes me wonder
a) is Zhuang Zhou's dream of being something wholly other than he, actually possible, or must it be just a fabrication added to a dream about flying;
b) is it implied by a dream, in which self flies, that bodies and souls are separate, because bodies cannot fly?