www.brookstone.com Sleep soundly with our amazing Tranquil Moments® sleep sound machine! Based on more than 23 years of scientific research, our Tranquil Moments sleep therapy system is a natural sleep aid that will help you achieve deeper states of sleep, relaxation and renewal. Our innovative sound machines for sleep use five nature soundscapes and seven clinically engineered sounds developed by the Center of Neuroacoustic Research. Just select 30-, 60- or 90-minute auto shut off and lay back for a great nights sleep.