Sleep Aid is a free Android app developed by Jack Feng that provides white noise to help you sleep. White noise is a continuous, repetitive sound that can reduce external disturbances and improve sleep quality. This app offers a variety of natural sounds such as ocean waves, birds singing, and raindrops falling on leaves to help you relax and get into a relaxed state. In addition, Sleep Aid offers tailored sleep aid music for different groups of people, such as blue lullaby and red relaxation music. With Sleep Aid, you can say goodbye to insomnia, anxiety, and lack of concentration, and welcome a better tomorrow.