We have been working with Sound Vitality since 2008, and are very pleased with the Infratonic Sound Science. The Infratonic 9 has helped Jack not only with his sleeping issues, but when he wakes up in the middle of the night with his sinuses completely plugged up, he reaches for the 9 and places it on his sinuses. He shortly returns to restful sleep, and when he wakes up, his sinus cavity is completely clear!