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.
Swelling in the ankles and legs is called peripheral edema; it is typically caused by right-sided heart failure. This may lead to nocturnal polyuria, or frequent urination at night. Your body converts the excess fluid into urine, resulting in you waking up repeatedly during the night to urinate.