I've seen many alarm clock apps. And separately I've seen a few "sleep sound / noise machine" apps. Is there an alarm clock app that can play white noise while it's running? And then shuts off when the alarm gets snoozed or turned off? Or alternatively, is there a White Noise app that has alarm clock functionality? I've seen some White Noise apps where you can set it to work for a certain time limit (6 hours, for example). But that's different than having it play white noise all night until 6:15am at which time an alarm goes off.