What causing someone, whom is dealing with any type of real life struggles, to randomly start having incredibly scary nightmares/dreams etc?

Sleep, Dreanms, and Nightmares
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Wow, I completely screwed this entire question up. However, everyone's answers/responses are incredibly helpful, so thank you all!!
What causing someone, whom is dealing with any type of real life struggles, to randomly start having incredibly scary nightmares/dreams etc?
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