"Demonialia, or Incubi and Succubi" is a shocking work by the Italian thinker Ludovico Maria Sinistrari, which addresses the forbidden issues of sexuality and demonology. The author explores the phenomenon of the existence of incubi and succubi, demonic creatures that, according to legend, tempt people in their sleep. In his book, Sinistrari paints a detailed account of these demons and examines the influence they have on people's sexual lives. This work, written a century ago, provokes controversial reactions and leaves many questions unanswered, forcing readers to think about where reality begins and where myth begins.