Sleep Bug is a Windows Phone health/fitness app that produces ambient scene music to help you relax and doze off to sleep. There are two versions available, Sleep Bug (free) and Sleep Bug Pro ($1.99). For the most part, both versions are essentially identical but Sleep Bug Pro has seven additional sound scenes or themes and Sleep Bug has only nine sound scenes and is ad supported.
The nine scenes that are available across the board include Beach, Music Box, River, Jungle, Weather, Horror, City, and Sci-Fi. Sleep Bug Pro adds Zen Garden, Forest, Train, Dreams, Outback, Airport and Underwater to the mix. Still not sure where Horror comes into play to help you relax and sleep.