Timer

Set the timer: 

Tap Timer, then flick to set the number of hours and minutes. Tap Start to start the timer.

Choose the sound: 

Tap When Timer Ends.

Set a sleep timer: 

Set the timer, then tap When Timer Ends and choose Sleep iPod.

When you set a sleep timer, iPhone stops playing music or video when the timer ends.

If you start the timer and then switch to another iPhone application, the timer continues running.