Do I need to leave my iPhone 5 on all night for the alarm to go off?

klam28

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Jan 5, 2016
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Yes, your iPhone must be on for the alarm to sound. The battery should make it through the night; it shouldn't lose more than 10%.
 

Rob Phillips

iPhone X & Apple TV Champion, Moderator
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May 1, 2012
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Welcome to iMore! Your phone can last quite a long time on standby. If you're concerned plug it in before you go to bed.