When DC originally announced this softcover series, it was supposed to comprise four volumes, collecting the entire 75-issue run of the original Sandman comics plus some extras (see “DC to Release Jumbo Softcover Collections of ‘The Sandman’”). Since then they have added a fifth volume (see “Get More Sandman with The Sandman Book Five”), which, like Book Six, includes spinoff stories by Gaiman and others. Sales of the volumes got a boost from the Netflix adaptation, which has been renewed for a second season (see “‘The Sandman’ Renewed”).
DC also recently announced a six-volume hardcover set of The Sandman that comes with a book stand shaped like the helm of Morpheus (see “Sandman ‘Morpheus Helm’ Box Set Coming in November”).