The one that I met that detained me in detail;

He was of African decent
He looked to be 40-45 years old
He was a little over weight but not fat
His height was around 5' 9"
His skin was light
He had a pock marked face
His hair was longer but was combed back. Looked a bit messy to me
He was wearing what looked like an olive green dress shirt untucked with tan slacks.

How could you "just dream" about someone you've never met that doesn't look like anybody you have ever seen, in such fine detail and still recall it after waking up?

You can't, because it was not a dream, I was there.