Gamma and Beta brainwave centered programs are associated with cognition and concentration. These may be listened to while working or engaged in an activity that requires your attention. It is not recommended to listen to programs that contain Beta and Gamma waves in the evening or before bed, because they keep you focused and alert. Alpha brainwave centered programs are associated with relaxation, visualization and creativity. Theta brainwave centered programs are associated with, hypnotic trance states, heightened receptivity, increased memory, and advanced meditation. Delta brainwave centered programs are associated with healing, detached awareness, and sleep. They affect you at a very deep subconscious level. Brain wave centered programs are intended for adults only and are strongly not recommended for babies or children under the age of 15, as their brains are still developing. Yes. To combine multiple programs successfully, determine which programs you wish to work with initially and at what times of day. For example you may choose to listen to Beta centered programs such as High Focus or Brain Power in the morning or while you work. In the afternoon you might want an alpha or theta centered program to unwind. And before bed a delta centered program. Read the descriptions of each brain state to determine what kind of mental energy you desire, and at which time of day. In addition you can listen to subliminals all day long over speakers, but itís not recommended to listen with headphones for more than one hour per day. If you are working with a particular goal, such as weight loss or attracting wealth we recommend that you listen to those once a day for a period of 4 to 6 weeks. 30 to 60 minutes per day is sufficient to establish a change. With the Secret Universal Mind Meditation, you can listen at a time when you want to meditate or while falling asleep. Everyone has their own signature brain wave activity, which changes throughout the day. Explore what works best for you. Notice how a particular program impacts you at various times. Trust yourself to know whatís right for you. And by all means feel free to experiment!