There is a scientific principle called entrainment. If two items are vibrating side by side at different speeds then the item that vibrates at the lower speed will adjust to vibrate at the same frequency as the other object.
Examples of this are swings in a playground that are swinging out of sync and adjust. Also, in a clock store you may notice the pendulum clocks of the same size swinging back and forth in unison.
Research has been done into the brainwaves of people in deep sleep states. Dr T has incorporated these brainwave patterns into his music to entrain your mind to reach the Delta state.
If you were to be subjected to these Delta waves which are embedded in the relaxing sounds, your mind will gradually reattune itself, so you can reach a similar state.
According to the sleeve notes, Delta is the most relaxed state state of deep sleep where dreaming ceases, and the body goes into its slowest metabolic rate, and lowest pulse and temperature. You need to be in this state for about 40 minutes each night so your body can recharge.
Dr Jeffrey Thompson has done extensive research into stress and the power of relaxing music and entrainment and has used that research to create pulses, chord patterns, sounds from nature such as rainfall, and mystical sounds. Sometimes these sounds are electronically changed to accelerate the mental response to get to the Theta state.
If you have problems with insomnia or emotional clearing, I highly recommend EFT (emotional freedom technique) which is a simple and easy acupressure technique which can be done in about two minutes. Imagine easily letting go of phobias, stress, depression, trauma, forgiveness etc. You can download a free manual at emofree.com or buy various books on the subject at Amazon.
I highly recommend another of Dr T's products Awakened Mind system, which I find very good for creativity. You will be so glad to have that product. The Theta Meditation system is also excellent.