Scroll way down to the bottom of the Hot One Hundred top breeders and youll eventually find the United States, hovering just at replacement rate with 2.07 births per woman.
Most of the time, no apparent cause for night leg cramps can be identified. In general, night leg cramps are likely to be related to muscle fatigue and nerve problems. The risk of having night leg cramps increases with age. Pregnant women also have a higher likelihood of having night leg cramps. Several conditions, such as kidney failure and diabetic nerve damage, are known to cause night leg cramps. But if you have one of these, you're most likely aware of it and have symptoms other than night leg cramps.
Dr. Oz, Dr. Weil, the Mayo Clinic, and other leading authorities, magnesium deficiency is the major hidden cause of night time leg cramps (including muscle cramps throughout the entire body), and no prescription medication can fix it. In fact, 78% of leg cramp sufferers have a severe magnesium deficiency.