Bose has started an Indigogo campaign for prototype testing of their new noise-masking sleepbuds. These sleepbuds are ultra-compact earbuds which isolate external noise and play soothing nature sounds to aid in achieving a good night's sleep.
https://www.notebookcheck.net/Bose-wants-to-improve-your-sleep-with-noise-masking-sleepbuds.263970.0.html