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if you change the text sound the vibrate is in sync with whatever sound you pick..i notice on different texts sound settings it vibrates to the ringtone...check it out.
 
Great point by BD22...

You can change the vibration pattern and customize it to your liking... scroll up in the Text Tone window.

Or you can add a custom ringtone that consists of a single high-pitched "beep", like this: http://www.soundjay.com/button/sounds/beep-07.mp3

It's unobtrusive, yet you'll acclimate to the sound easily. This is what I've done, but you have to find a short tone that works for you. YMMV
will that work i can't hear it when i lay on my bed stand
 
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