With the edition of FELICES PESADILLAS (number 200 of this collection) Valdemar marked a milestone in our country as far as the anthologies of fantastic literature and horror are concerned. "I have read many dozens of anthologies of horror stories in my life, but I dare say that this one surpasses them all, both because of its generous breadth and because of the skill of its selection," wrote Fernando Savater, a true fan of the genre. A thousand pages saturated with the classic themes of horror stories: death, ghosts, the devil, vampires, zombies, crazy wise men, revenge, fate ... BAD DREAMS DREAMS poses both a continuity and a complement to the aforementioned anthology: authors who for reasons of space did not find a place in that first volume now enjoy the place they rightly deserve. The most classic authors repeat, as is logical, because they have laid the foundations of the genre. We can only wish the kind reader to enjoy the stories ... and that these BAD DREAMS become HAPPY NIGHTMARES.