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.
For many people, however, leg cramps occur at night while they sleep and not while engaged in sports. Such cramps may be caused by dehydration (which can be associated with diarrhea, insufficient fluid intake, excessive sweating), a deficiency of calcium, potassium, and/or magnesium, or for reasons unknown.