As one goes from various states and alterations of consciousness makes this entirely possible.
I have had this happen to many of my very vivid dreams. Moreover the lucid dreams that I am conscious in.
As you pointed out the dream realm and the waking scene soon return to normal.
Since reality is nothing more than an experience and do to the fact that your brain, during a dream, does in fact think it is real this opaque view of memory can be obscured over time. Depending also on how real or surreal your dream content is.