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The mind/brain imagines things in a very uncontrolled way when we're asleep, and it basically does this by using various stimuli (sights/sounds/etc.) we've experienced before and combining them in expected or unexpected ways. By "expected" I mean that we may recall a known/real person in our dreams from memory, and by "unexpected" I mean that we may randomly ...


We do not know. Simply put, we do not understand the function and mechanism of dreams enough. Much talk about dreams are hypotheses based on our extremely limited understanding (see references in Josh's answer). You think that you have dreamt of something that is impossible, therefore I think you are not asking "is it possible to dream of something that is ...

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