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does that count?
I still remember it vividly
I never did understand kids who said they didn't want to grow up. They must not have had school, or older siblings, or parents who pushed them. Even then it didn't make sense to me, lol.
The most plausible IMO is that deja vu is a result of a delay in nerve transmission to one part of the brain but not the other, and your subconscious, in a scramble to come up with an explanation, plants a memory of a dream after the fact.
But I personally kinda like the idea that your dreaming mind just constantly projects so many what is that every now and then one has to be pretty close, lol.
Though the one with the most interesting implications is that your dreaming mind is better at prediction than your conscious mind is.
The brain knows it is in a safe place, that's why you fell unconscious (part of the reason--you felt safe...and you were also tired). Your brain is not going to mentally scar you on purpose. It knows it would be damaging to its own functionality.
Trauma occurs with physical pain, psychological pain (sleep deprivation, traumatic event, etc.). It will not happen when you're sleeping and dreaming.
Dreams are manifestations of your biggest fears, or your greatest desires (usually, if it's one side or the other. Sometimes dreams make no sense)
Realize that these dreams, they can't hurt you, and they're not real. You are safe.
Yes, it could.
But, one also assumes the person understands the difference between reality and dreamstates. It depends on how strongly someone carries over that experience into the "real" and dwells on it not as if it was a dream, which doesn't have a lot of rules, but then reacts to it as if it's "real," particularly in how they "feel" about it.
Edit: Added - To emphasize this" It's more likely to add or supplement "trauma" or other issues like anxiety, depression, etc, already being experienced by someone rather than being a sole cause of it, though.
If you're frightened, what happens? Well, you're frightened, but that means something different to your physiology than it does just in your thinking about it. Your heart rate increases, your pupils dilate, your breathing comes quick, your adrenaline surges, you get knots in your stomach, your get "chicken skin" or "goose bumps" and the hairs on your skin stand up, your capillaries in your skin may even contract a bit, turning you pale, giving you chills...
https://www.livescience.com/56691-the-science-of-fear.html
No matter what caused it, whether or not it is a dream or it's real or in the movies..., once it's alerted, your physiology doesn't care and your body response accordingly.
It's not easy to tell yourself you're not afraid upon waking from a nightmare when you're' shivering, have goosebumps, your hairs are standing on end, your heart is pounding... Not easy at all. You literally have to fight through it, forcing yourself out of the state of fear and anxiety you're already in.
The mind and body are intimately connected and they influence each other's operation. Your brain knows that the thing that caused the response isn't real, but you have decided it was a traumatic fear worthy of reacting to. Your body responds just like it would to a real fear. And, what does that tell your brain? "It's something really scary." It's a sort of feedback-loop where your brain is reading the signals of fear from your physiological response and even though it knows the cause is not real, it still reacts accordingly to what the body is doing.
This is the "high" being chased by fans of horror movies. :) They greatly enjoy that rush of adrenaline and the body's responses to the imagery and accompanying thoughts. They know it's "just a movie" but they still respond accordingly as if it was nearly "real." People chase a lot of things that elicit big, natural, chemical dumps from various organs...
Many of these same physiological responses can occur in reaction to a vivid nightmare.
That pairing with real, physiological, responses and the imagined, dreamed, imagery, makes that dream all the more "real" upon waking. Why wouldn't it be? Your body thinks it is, after all.
It would be nonsensical to think that it would not be possible for such experiences, especially if intense and suffered by someone already susceptible or already suffering from other issues, to not have the possibility for a "real life" impact.
So... "Yes, it could."
So, you recollect a particularly traumatic dream. What's your state when remembering it? Are you already troubled, anxious, depressed or suffering from other things that may mean you're already vulnerable? If so, such a dream may just "pile on" to what you're already going through. It wouldn't necessarily be unlikely that one may have particularly vivid or distressing dreams while already suffering from such things.
For instance, someone suffering from PTSD may have nightmares where they relive or recreate traumatic memories and re-experience them very vividly. What's the reaction? The person may feel they can't escape the trauma, even in sleep. And, what if they only lightly touch on those memories, like of friends killed in war that has caused them so much trauma? Upon waking, they're again reminded of the trauma. And, they have their body's blind physiological response to anxiety and fear to remind them of it.
Repetitive nightmares can also have their own trauma that fuels them, too. Think of a particularly frightening dream, like dreaming "Freddy Krueger" is real. For some, a terrifying dream could fuel itself in certain circumstances. But, it wouldn't be as likely to be recurring/repetitive for someone who's well adjusted, not currently going through some other problems, etc. Coupled with the physiological response, the brain is still going to note that excited physiological state just as the body is reacting to that imagined dream. Children could also be a bit more susceptible to something like a vivid, terrifying, dream.
Note: Nightmares don't have to always indicate some real-life issue the brain is busy trying to work out, categorize, and store behind the scenes. They can. But, everything from gas, indigestion, sudden uncomfortable bladders, aching legs, etc.. can influence dreams. Sleep paralysis, where the brain's coordination shutting down systems is a little "off," sleep apnea, where the airway becomes constricted, etc can also have a huge impact when associated with nightmares, making them even more vivid and harder to forget upon waking.
Once something like this is so very traumatic, it's natural for a person to "dread" the event reoccurring. That can result in another feedback loop - Our brains tend to ruminate over our thoughts before sleeping... That doesn't help... To fix? Start a routine getting ready to sleep that avoids the physiological responses of fear and anxiety and avoids thoughts like those that make up the reoccurring nightmare. Read a happy, funny, story, spend time cooling down and relaxing, avoiding excitement/stimuli.
If you’re not having physical symptoms, then unless you have some severe impairment which would prevent your capabilities while awake, then when you’re awake—you have more potential than while asleep to affect your mind.