How to get a sleep alarm on iPhone?

So, I have searched on google how to get an alarm of some sort to turn of your iPhone after an amount of time and it's been saying go on timer, set the time and then click 'When Timer Ends' and it says click the first option which is 'Sleep iPod' but I don't have that button on my options. It also said 'set the number of hours or minutes you want in iPhone-as-an-iPod' and that's how you get the 'Sleep iPod' option but I haven't got that an I'm really confused!

Sleep timer built in it for years. Not many know about it.
Best luck.
Bottom of this link look for timer.
http://www.idownloadblog.com/2014/04/12/ios-7-the-ultimate-clock-app-guide/
Play music before bed.
http://evolver.fm/2013/10/15/how-to-fall-asleep-with-iphone-music/

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