Scientific point of view: The latest scientific research has found that during sleep, the brain will sort out the information received during the day and adjust the mood. Most people start to have unhappy dreams when they sleep, and then adjust their mood to a happy state after midnight. So it is normal to have nightmares. If nightmares affect sleep, you should pay attention to relaxing yourself, adjusting your life, reducing stress, and seeing more positive things. If it is particularly serious, see a doctor. nothing
Unscientific perspective: If it's a nightmare, it's just the opposite in reality.