Some events and thoughts lately have brought me to contemplating about the structure of dreams...

Worldly logic dictates that actions cause consequences, which, in turn, are actions as well. Thus, actions form endless processes.
Could such logic be used to explain dream structure?

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Theorizing on such logic the process of dream creation is as follows: when falling asleep hypnagogic imagery (independant thought) kicks in, it continues for a certain amount of time changing and evolving also following the same logic: actions cause consequences and back to actions again; but at some point the hypnagogic imagery ends leading to delta sleep. Eventually the first stage of REM sleep begins...this is where the question stands. Does the "action->consequence" logic hold true here? If so then the first dream of the night begins from where the last thought patterns ended. But then, after the first REM period ends and the second begins following another delta sleep period, does this second dream start off exactly where the first one ended?

Considering such logic one might ask: then why does one have completely different dreams on different topics? That makes sense taking into consideration that same "action->consequence" logic again because it would mean that dreams are simply logical evolutions of concepts...meaning that the last conscious thought one has before drifting off leads into hypnagogic imagery where it begins evolving following some sort of logic and then the evolution process continues on into the dream state.

All this leading up to thinking: dreams and their structures aren't actually random...or are they?

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Those, however, are merely my thoughts on the matter. Perhaps anyone else has any theories or input?