We pass through several stages of sleep to achieve a restful state. Delta sleep is the most physically relaxed stage of sleep and the time when the body recuperates and renews itself. Getting enough delta sleep is essential for good health. Using special sound frequency pulse rates mixed into musical soundtracks causes a brainwave relaxation state conducive to deep relaxation and restful sleep. The Delta Sleep System uses a number of techniques to place the body and mind into an optimal state for rejuvenating and recuperative sleep. Whether you have difficulty in getting to sleep or staying asleep, the Delta Sleep System, along with the recommended techniques included with the CD will help you fall asleep and wake up rejuvenated. It will not cause your brainwaves to stay in delta sleep all night. Your brain will go through its normal sleep cycle, but the Delta Sleep System will help you to remain asleep.