Why does my iPhone 5c vibrate randomly?

I recently got an iPhone 5c and IIm having some odd vibration issues with it. It's vibrating randomly.

Whenever it does this, I check my email and there are no new messages. I go into notifications and there's nothing there for that time-frame. In fact, the last time it happened, the most recent notification had been a full hour beforehand.

It happens whether it's plugged into a power adapter or not. It doesn't happen incredibly often, but does happen a few times a day.

I d just like to figure out what's going on with it.

Check your application settings, maybe there's apps that are have notifications set to vibrate.

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