The first hypnosis can be listened to at any time of the day. This version is not subliminal and will need your full attention. The rest of the chapters are meant to be listened to on a low volume during sleep for maximum subliminal subconscious stimulation. Pink noise is included to help aid with deeper, more restful sleep. It is okay if you do not understand what is being said during this version, as your subconscious has the ability to pick up more information than your consciousness.