you can use this app for sleep and relax ;)
This app have got sounds for sleep , for example naturel sound , fire sound , wave sound , rain sound , plane sound . And you can set timer (15 , 30 min or 1 hour or always) for countdown after you can sleep .Good and good a sleep wait you with Sleep Help
for sleep rain, fireplace, aircraft, natural (bird), the sound of water will give you peace of mind at night