Sorry, never got back to this. Mostly because I was planning on a re-read and never got around to it... it's really hard to pin down a specific synopsis because there are a lot of arcs and side-stories, as Katie said.
I view it as a R/NC-17 because I wouldn't be allowed to hand it to any 16yo I know. And that's sort of fine with me because I think that the emotional impact of the stories goes up with the more experience with life that a person has. (Also a mark of re-readability over time!)
Yeah, it's a DC comic but it's the Vertigo ("Mature readers") imprint. I believe DC has a Golden Era Sandman which is a different character but referenced in the first volume of Gaiman's Sandman. (The first volume also features cameos with John Constantine (Hellblazer) and something Martian (I believe he's in a number of DC comics) as it had not been decided quite yet what place Sandman would have in the DC Universe. Vertigo was not its own imprint yet.)
This is Gaiman's Sandman:
http://spinoff.comicbookresources.com/w ... unters.jpg(One form anyway. His character design changes a lot because in each culture that he visits, he appears in a different guise. This is his classic Oriental folktale design.)
Supposedly too they are going to make a TV series of it but I'll believe it when I see it. Also I would rather it be made for one of the main networks instead of HBO like the last rumours I heard said...