LOL. My wife and one of her friends both get it, but then she's 7-8 months pregenant and her friend is due to drop any moment.
Not sure how much you can do about it. Might be related to low salt and potassium levels in your body. One thing that does help is having a warm bath before bed time to warm the legs, and then sleeping with hot water bottles or warmed wheat bags on the legs.
Apart from that I'd suggest going to bed blind drunk every night so you pass out and don't notice it...
I.