Dreaming of a coffin can be a metaphor for rebirth, or it can be a change of mind or soul into another stage, as well as the abandonment of unhealthy bad habits and the separation from the old environment.
In addition, there is a folk saying that dreaming of a coffin means promoting to a higher position and making a fortune. In some dreams, dreaming of coffins does imply a good explanation for wealth.
Coffin dream is a typical anti-dream, auspicious dream and rich dream! !
I think improving sleep is the most scientific choice.