Why does my iphone5 keep doing this weird noise?

Today, whenever my phones screen is off it will vibrate sometimes as if i'm getting a text or a notification, but my screen doesn't light up and i have no notification there. This happens around every 15 minutes, twice or 3 times a go. Its really annoying me and i don't know why this is happening. Has this happened to you before? Will it end?

It might just be that you're getting an email. Everytime your phone vibrates and there's no notification, check to see if you've gotten an email. You probably have your email set to "send & receive" every 15 min.

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