Sleep is a Windows Phone sound generator app that has recently been bumped to Windows Phone 8. It generates soothing sounds designed to help you relax and eventually fall asleep. Version 1.4 adds silence and stream sounds to the mix and adds the option to buy a premium pack of six sounds for $1.29.
The premium pack for Sleep, which is an in-app purchase, includes airplane, snow, hot tub, light rain, rain on the roof and train sounds.
In addition to the primary sounds, you can add thunder, wind, frogs, crickets, chimes and fog horn accent sounds to the primary sound. So if you want to only hear crickets, choose the Silence sound from the tile menu at the bottom of the screen and crickets from the side menu.
Individual sounds from Sleep can be pinned to your Start Screen for easy access and Sleep does have a timer function that ranges from five minutes to ninety. Or you can just let the sounds run continuously.
Sleep is a free, as-free app for your Windows Phone 8 device with the option to purchase the premium sounds for $1.29 within the app. You can find Sleep here in the Windows Phone Store.