Having nightmares in sleep?

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Hey,guys.I guess everyone of you have such experience when you fall asleep,some nightmares may dawn on you.All right?For me,I sometimes dream that someone is hunting me and i try very hard to escape.so when i get up next morning,I will feel very tired.How often is it for you to have a nightmare in your sleep?And what's the scene that usually happens in the nightmares?