This gives a really friendly and accessible introduction to the study of biorhythms, sleep theories, dreaming theories and their applications. It also gives a clear view of the main approaches to the psychology of hypnosis. It's a great way to learn about the psychology of awareness, and includes some modern theory eg on lucid dreaming. It's by my old psychology lecturer and is typical of her work. I found it really useful for both my A level and undergarduate work. Buy this book - I couldn't find anything as useful!