The Sandman mantle is heavily associated with DC Comics, though not quite in the way that most legacy characters are handled. The most well-known take on the concept is Neil Gaiman's Vertigo Comics Sandman, though this incarnation is mostly unrelated to the original Golden Age character. Not only is the classic Sandman somewhat obscure, but his sidekick is even more unknown.
Source：https://www.cbr.com/where-is-dc-justice-society-sandman/
