Started feeling some mild leg cramps during the night and although it's not as bad as a charley horse, it did wake me up from my deep slumber.
My hubby gave me a very good suggestion, which works quite well. Sit up on the bed with your legs stretched out. Point your toes towards the ceiling (do not point your toes like a ballerina or that will make it worse) and pull on your big toe. Seems a bit silly, but it worked for me. My hubby actually learned this as a kid when he took swimming lessons. The instructor told him to pull on his big toe if he ever gets leg cramps in the pool.
Voila, a simple solution to a pesky problem.