I have dreams. Yep, I can hear your inner voice saying: "Er, ...so what? Me too!"
But I believe these are different.
I think what we can say about dreams in general is that they come and go. Some you remember. Some you don't. Some are gone the very moment you open your eyes, just leaving a certain feeling. Some nest themselves inside your head. Mostly loose episodes your mind made up to entertein you while you are on hold.