1. tachycardia or bradycardia
We know that a fast heartbeat can cause the feeling of being chased; Jumping too slowly or beating too early will cause the heart to hang and sink. Therefore, people who are prone to palpitations will have nightmares of being chased at night (occasionally causing dreams of chasing others) and people hanging and falling.
2. Insufficient blood supply to the brain
Cerebral ischemia can cause terrible dizziness, palpitation, chest compression and various neurological dysfunction symptoms. Therefore, anyone who is weak and prone to cerebral ischemia, who is overly fearful and whose pillow is too high during sleep will have a terrible nightmare at night, which is called a nightmare in medicine because his chest is suppressed or chased by some terrible demon and he can't shout or run. Sometimes, when people just wake up from cerebral ischemia, because the visual and motor disorders that last for a few minutes are not over, people will struggle to wake up, but they can't wake up. In short, everything experienced in dreams is what people think or experience during the day. No one will feel mysterious and afraid because he suddenly thinks of a person who has been dead for many years during the day, so there is no need to feel mysterious and afraid because he suddenly dreams of a person who has been dead for many years. Similarly, no one will feel mysterious and special because of all kinds of palpitations during the day, so don't care too much ... adjust your mentality and relax before going to bed.