I am not sure if I am the only one who is facing this problem, but interesting thing is that my Iphone 5S(IOS 10.x.x) vibrates everyday 12 O'clock for several seconds and there is no way I can stop it. It is really annoying at work place. I checked if I have any alarm for 12 O'Clock, but I did not find one.
Any clue does it happen and how to stop it? Thank you in advance!