You may want to visit http://bluemars.org
to check out if there's anything there that you fancy entering in your presets
Bluemars-Cryosleep is listed as an approved station in the Radio Roku database, and plays worldwide.
Bluemars.org plays a selection of peaceful melodies . . . . it also has two other great radio stations; Bluemars itself is advert-free and will certainly induce sleep.
Whitenoise247.com has various streams that you can download, and then stream to your SoundBridge with Jamcast http://www.sdstechnologies.com/