What does this dream mean?

For the last 20 years or so, once every few years I keep having this dream where I forgot to get something out of the garage before I moved out of my old house. In the dream it's the house I moved out of when I was 21, the house where my mom died. It's been dining me crazy for 20 years, to the point where I'm almost ready to drive there, knock on the door, and ask the people that live there to let me in the garage to look around.

What does this dream mean?
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