I just turn 50 and not as a rove as i use to be. recently at night my left leg from knee down to ankle starts cramping causing me to get out of bed.?

Few things: Need to make sure this is not due to poor circulation first and foremost. Once this is ruled out it may be secondary to a magnesium or possibly potassium deficiency. That is what i would check first, .

Circulation: You have developed classic night leg cramps. This happens when the feet are up and gravity is working against you, it will decrease the blood flow to your feet, building up something called Lactic Acid that will create the cramping. As you get out of bed or massage your legs, you are increasing the oxygen returning to your foot and the cramps go away. See your podiatrist for meds to help.