Bucky's famous 40 blinks sleep mask is a landmark in the most comfortable, convenient sleep. With a 99% customer approval rating and hundreds of thousands of sleep masks sold, this is the best sleep mask on the market. Block out light and sleep soundly anywhere life takes you! The main reason people can't sleep is too much light—darkness stimulates the body's natural melatonin production, which helps you achieve deep, restful, and restorative sleep. Use the 40 blinks on flights, during short naps, in college dormitories, or for a better quality of sleep at home. Traditional sleep masks feel heavy on the eyelids, let ambient light in, and use elastic loops that pull on the ears.