I've heard about this, i don't dream a heap these days (at least, i don't remember much significant) but when i was a kid i could generally control things.
Back to a young age. Not sure what that means, but i never thought much of it, i never thought that controlling your dreams was abnormal.
Very rarely ever had nightmares as a result. Or rather, if they started, i'd bail out before they got too bad
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Well... my dreams were always not like real life, but i could control the flow and basically guide things.
It was never to the degree of "i imagine a red car at this location, doing this particular thing" - all those sorts of details were filled in, but more a case of me knowing i could do whatever i like (e.g., the classic "Falling" dream people speak of - i would just dream that i was able to fly), and normally switch to a different scene or place if i felt like it.
e.g., if i was having a "bad" dream i could/can just stop dreaming about it and imagine i was somewhere else.
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I have woken up in the middle of the night after dreaming about how to solve problems, written it down and solved them.
Code/algorithms, mechanical problems with car modifications, etc. Not often (see: being more fun as a sex/flight/whatever simulator) but if something is really bugging me, i end up thinking about it and possibly fixing it...
Nikola Tesla apparently could build and simulate his inventions in his mind. I think he likely had some sort of super lucid dreaming ability, and perhaps even to do it while awake (he only slept a few hours a day apparently, so likely had
some sort of method for daytime naps, or his brain otherwise somehow adapted to little sleep and that ability was a consequence - some sort of dream-like state while being functionally awake).