"Hallucinations" is the last popular science book by the famous neuropsychologist Oliver Sacks, whose works are well known around the world. So—hallucinations. In the Middle Ages they were explained as spiritual enlightenment or, on the contrary, as possession by the devil. Dozens of people were declared saints, thousands were burned at the stake by the Inquisition. In modern times, they are generally considered a sign of madness, a severe illness, or the result of taking drugs. But is it really so? You’re sound asleep in your room and suddenly wake up to a sharp knock at the door. You jump up and go to the door, but there’s no one there. “I must have imagined it,” you think, not realizing this was a typical hallucination. “What hallucination? I’m not mad!” In his book, Oliver Sacks turns to the world of hallucinations, and as always, the main value of an audiobook lies in the real stories of people who have fought stubbornly to regain mental health and a full life.