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.
Nighttime or nocturnal leg cramps, which affect more than half of adults, can also be triggered by tiredness. Although there is no one definitive cause [of nighttime leg cramps], they are likely associated with muscle fatigue and nerve dysfunction, Dr. Sontag explains.