Naturalist definition, a person who studies or is an expert in natural history, especially a zoologist or botanist. See more.
Nighttime leg cramps are a sudden intense pain in the thigh or calf. A cramp is a tight muscle that won't relax. They can be caused by mineral deficiency.
There are many differences between leg cramps at night and restless leg syndrome, including: 1  RLS does not cause pain or cramping, while nocturnal leg cramps do. 2  RLS is more of a discomfort or crawling feeling in your legs. 3  RLS causes the desire to move the legs, while nocturnal leg cramps often prevent movement.