Nature Sounds Relax and Sleep (Android) - lets you choose from a list of 6 different good quality nature relaxing sounds (sounds of nature) which include thunder, ocean sounds, sea, birds sounds, rain, night in jungle, water sounds, waterfall, nature and start your personal audio therapy.
Relax Melodies (iPhone) - designed with a good night’s sleep in mind. If you have difficulty getting to sleep or feeling rested in the morning, then this is the app to try. Beyond sleeping, the app is great for any situation that requires calming sounds or music, such as yoga.
Not an app, but highly recommended by students:
Sleep With Me: A Sleep Inducing Podcast
In each episode, the narrator delivers meandering, stream-of-consciousness monologues in a monotone that recalls the most boring teacher you ever had. Each hour-long episode sets out to bore its listeners to sleep, distracting them from their own thoughts with bizarrely earnest monologues on zombie songs or Diana Rigg or Ser Pounce, the royal cat from Game of Thrones.
Sleep Cycle (iPhone)
An intelligent alarm clock that analyzes your sleep and wakes you in the lightest sleep phase – the natural way to wake up feeling rested and relaxed.
Deep Relax (iPhone)
A companion for sleep improvement, stress relief, yoga practice and meditation