Or perhaps you may be suffering with Restless Legs Syndrome - I am a sufferer. check out
Read More I have suffered with these cramps since I was a young child which got worse as I got older. After seeking a lot of medical advice and taking part in various tests I was finally diagnosed with this problem. I now take carbamazephine tablets when they are bad - particularly at night. I am not suggesting you definitely have this problem but just felt you should know this information and should always seek medical advice.