If it is a sleep hypnosis CD, it is better to listen to it before going to bed, and sleep while listening. First of all, I don't know what kind of hypnosis slimming CD you have, but generally speaking, if you are slimming, it is better to listen to it at other times, such as morning or afternoon. Just listen once. Hypnosis doesn't really put you to sleep. When listening to a CD, try to make the instructions in the CD work for you and achieve results. Generally, it will take 20-30 days to achieve certain results.