I will give you an explanation under limited conditions for your reference.
1. Have you visited patients recently, or visited hospitals, funeral homes and other places, because everyone has a lot of fears after arriving in this place. If it just proves that you are too nervous.
2. Have you been overworked recently, making you nervous, or watching TV series, etc.
There are three kinds of dreams: memory, future and fantasy.
4. Did your dream environment appear in the past real life? Or the illusion of external reasons (fatigue. Tension) interference? Pay attention to your dreams in the future.
For reference, I am also exploring.