title: Second opinion. I've had trouble sleeping lately because I tend to get cramps in my calf muscles and feet at night. What causes these cramps? What can I do about them?
mesh_terms: D006801:Humans; D012307:Risk Factors; D012893:Sleep Wake Disorders / Q000209:etiology* / Q000628:therapy*; D020922:Sleep-Wake Transition Disorders / Q000209:etiology* / Q000628:therapy*