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brain activity is random during dreams.
however, this does not mean that dreams themselves are random. one possibility is that our psychology determines how we interpret these random signals in our brain.
another is that our brain appears to be behaving "randomly" because our souls have left our bodies (like getting 'snow' on a TV channel with no signal). dreams have often been likened to supposed "out-of-body experiences".
I don't think we'll know much more about dreams within our lifetime.
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