I shake randomly?

Ever since i was young i would always "Shake" at random times almost as if shivering, but for 1-2 seconds and i still do it to this day. Ive never mentioned it to a doctor or anything because it hadnt ever had an effect on my life beside the occasional "shake". It also happens once within, at... show more Ever since i was young i would always "Shake" at random times almost as if shivering, but for 1-2 seconds and i still do it to this day. Ive never mentioned it to a doctor or anything because it hadnt ever had an effect on my life beside the occasional "shake". It also happens once within, at max, a two day period.

Could anybody give me some insight into what this could cause me to do this?
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