Iphone 5 text won't vibrate in sleep mode?

Ok I looked on several sites and went through trial and error and nothing works! So my iPhone will not vibrate in sleep mode for text messages at all its frustrating because you put it in your pants for ten minutes and look because you don't feel it vibrate. Then I would look it would have like 5 text messages and I didn't even know! Its happened numerous times and I would like it to work. So please help!

I don't think there's a way to stop vibrate maybe scroll through the options to find or you can just like wrap it in a blanket and you wouldn't feel or hear it just reamber in the mooring where it is!

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