Dreams are a kind of psychological activity when people are asleep. The psychological activity in dreams, like the psychological activity when people are awake, is a reflection of objective things in the human brain. The bizarre dream in the dream is the illusion of stimulating various objective things when people are unconscious during sleep.
For example, when people are awake and tachycardia, the palpitation feeling as if being chased becomes a bizarre nightmare, and when people are awake and their heartbeat is slow, the palpitation feeling of hanging down becomes a bizarre nightmare of falling in a dream.