Clark Leonard Hull was an American psychologist who is best known for his theory of learning. He wrote a book called “Hypnosis and Suggestibility: An Experimental Approach” in 1933 which is still considered a classic in the field of hypnosis. In this book, Hull explored the correlations between various forms of suggestibility and between suggestibility and intelligence and other personality traits.

• Hypnosis and Sleep: Exploring the Connection
• Hypnosis for Sleep: Does It Work?
• Hypnosis for Sleep: A Guide to Hypnotherapy for Better Sleep