Talk:430: Every Damn Morning
This perfectly explains my theory for the origin of Deja vu! You have a dream, but because you don't bother thinking about it when you wake up (The act of thinking about it moves it from your short term memory to your long term memory), it fades away to some inaccessible place in your brain. (It's not deleted. Nothing is ever deleted. It's just archived) Then, you see something in real live which, just for a split second, brings back the memory of your dream. But it disappears as soon as it appeared, before you can register it. This leaves you wondering what it is that feels so familiar.
I have heard that most dreaming is associated with the right side of the brain (for example, right inferior parietal cortex: http://www.dreamscience.org/idx_science_of_dreaming_section-3.htm). If this is true, it would make sense that, upon awakening, the visual imagery of dreams is not transmitted well across the corpus callosum to the left side of the brain, where most language skills reside. If you cannot efficiently translate the images into words, you can't communicate them in words. Being quite complex and unusual, the dreams would then fade from memory.