Will my iphone alarm still go off when i have an app running overnight?

I've had sleep cycle on my phone for around 5 months now, but I haven't had the chance to try it out yet. I'm normally a very heavy sleeper and I have to get up super early in the morning which makes me even more sleepy. I want to see if it will work for school or if my 4 normal alarms will wake me up.

It sure will: D

  • Will my iPhone's alarm go off even when I have apps open? I'd like to fall asleep to a relaxing YouTube video but I want to make sure my alarm will still go off in the morning!
  • Will iPhone alarm still go off? I want listen to iphone as i go to sleep but i also need it as an alarm to wake up in the morning. I know that the earbuds will probably fall out of my ears so i want to know if the alarm will still go off through the speaker of the iphone itself instead of just through the headphones? Good thing school is almost over ill only need to use this two more times.
  • On the IPhone can an alarm still go off if? Will an alarm still set off on an iPhone even if you are in "Do Not Disturb Mode" I never turn on the Do not disturb mode so i'm not sure if the phone stops ringing for everything or if an alarm will still go off. Cause blackberrys alarms will go off even of your in silent mode but this is my first iPhone so I have no close. My model is the iPhone 5 with all my updates! P.S- anything else about "Do Not Disturb" mode that I should know?
  • Is there an alarm clock app for iPhone that launches a radio app? I like to listen to a morning radio station on the Radiopup app and need an alarm clock that can launch that app. I have Radiopup set up to automatically launch to the station but need an alarm clock to launch Radiopup. There may be times where I want to wake up to Pandora, iHeart radio, or TuneIn. Does anyone know an app that will launch another app?