Many people sleep with a fan on to drown out other noises. However, this is inconvenient when one is traveling or the room is already cold.
Exit: fan, Enter: Deep Sleep Fan.
This new app simulates a fan with the option to play at two different speeds. It has a unique oscillation mode which pans the sounds between the left and right speakers. In addition, it introduces a fader which is adjustable for up to one hour.