Hypnagogia facts for kids
People in this state may have experiences that resemble hallucinations, but are not. The person usually knows that it is not real, but very often nothing can be done against it. Most of these pseudohallucinations are visual experiences.
The writings of Aristotle already talk about hypnagogia. In more recent centuries, many authors have referred to the state. Edgar Allan Poe, for example, wrote of the "fancies" he experienced "only when I am on the brink of sleep, with the consciousness that I am so".
Serious scientific inquiry began in the 19th century with Johannes Peter Müller, Jules Baillarger and Alfred Maury, and continued into the 20th century with Leroy.
With electroencephalography (EEG) in the mid 20th century, detecting such a state has become easier.
Hypnagogia Facts for Kids. Kiddle Encyclopedia.