There is no reason why philosophers should know about dreams, especially as they see dream
analysis as on a par with drawing up horoscopes. All there is here is supposition. Rather pedantically,
one might say that you cannot have the same dream but about another person, since each of you are
dreaming about someone else. If those who feature in the dream are different, the dreams cannot be
the same. However, you can dream about the same events, but only if you belong to the same culture
and have the same concepts otherwise the analysis of imagery, which brings the symbolic down to
the level of ordinary conceptual understanding, would differ in translation and so what each of you
dreams would not be the same.
Freud thought that dreams have a physical cause, a cause in real life and that they constitute a
wish-fulfilment. The physical cause could be an actual desire to be with, or to be, the person you
dream about, the real life cause that you have recently been together or have thought about each
other so this person is in your mind, and the wish-fulfilment you will have to think yourself on the basis
of the nature of the events.