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.
ANSWER: Anyone who's ever woken up with a leg cramp knows how painful it can be when one of their muscles suddenly contracts. Night leg cramps typically involve calf muscles. Yet, it's possible to get these cramps in the feet or thighs, as well. In most cases, night leg cramps are harmless and can be relieved or even prevented with some simple stretching or other self-care measures. However, if they occur regularly and cause severe discomfort, see your doctor.