Yes, ditto to every word you said. I have nightmares too. The unfortunate part about nightmares: Whilst I am asleep I cannot know the difference between dream and awake; they are equivalent for me. Later, after I'm awake, then I do know the difference (I am not psychotic).
Plus, I am a sleepwalker. I do not dream (I think) when I sleepwalk but walking up whilst sleepwalking is scary! Good thing I'm not a crafty sleepwalker; I stay confined to my apartment and usually wake up at the window or in a closet. Don't tell...I never tell anyone, except maybe my doctor.
I suspect this is concurrent with autism since our circadian rythym is different and does not coincide with normal sleep cycles. I do know, for sure, my sleep problems are exacerbated by stress, exhaustion, etc.
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The ones who say “You can’t” and “You won’t” are probably the ones scared that you will. - Unknown