Actually, I really want to say, maybe your uncle misses you ~ ~ well, let's not talk about horror movies. That coffin generally means promoting to a higher position and making a fortune. Then this promotion and wealth may be related to your dead uncle, which is only a possibility, not absolute, or you sometimes dream that something happened to your uncle these days, which is just a simple dream and has no special significance. I dream every day, so now I find some patterns. Many times dreams are just a reflection of some things encountered in reality. If you dig deeper, you may find that it really means little.
The above is my superficial understanding ~ welcome to read it patiently ~ ~