IPhone 4 vibrating for no reason HELP

My iPhone has been vibrating every 2 hours or so for the last two days for no apparent reason to me. I have not recieved any notications and am wondering why this is happening. In the last 20 minutes it has vibrated 3 times.

Have you checked the settings in sounds...
iPhone User Guide
http://manuals.info.apple.com/en_US/iphone_user_guide.pdf
Try a Restart and a Reset...
Restarting your device
1) Press and hold the Sleep/Wake button for a few seconds until the red "slide to power off" slider appears, and then slide the slider.
2) Press and hold the Sleep/Wake button until the Apple logo appears.
Follow these steps to reset your device
Note: Reset your device only if it is no longer responding and the steps above do not work.
Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.
http://support.apple.com/kb/ht1430

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IPhone 4 vibrating for no reason HELP

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