👉 In philosophy, hypnagogia refers to a state of intense or vivid imagination that occurs when someone is entranced by a dream-like vision. This phenomenon has been extensively studied and interpreted in various philosophical texts over the centuries, including those by Aristotle, Plato, Socrates, and Goethe. The term "hypnagogia" was coined by Jean-Paul Sartre in his work "The Phenomenon of the Imagination" (1945).