With the villainous Insomnia having sent nearly the entire world into a nightmarish slumber, the heroes left to defend the DC Universe are few and far between. In fact, their numbers are so low that Boston Brand, better known as Deadman, has even resorted to bringing fallen heroes back to life in the hopes of bringing the horror to an end. Or rather, he has brought back one very specific hero, knowing that if anyone can save them from Insomnia, it has to be the Sandman.
Source：https://www.cbr.com/why-dc-knight-terrors-brings-back-original-sandman/
