I sometimes get painful leg cramps that keep me awake at night.  What can I do to prevent them, and are they a sign of something serious?
D000075202:Contraindications; D004326:Drinking; D006801:Humans; D009125:Muscle Relaxants, Central / Q000008:administration & dosage; D052580:Muscle Stretching Exercises; D011803:Quinine / Q000008:administration & dosage; D020922:Sleep-Wake Transition Disorders / Q000517:prevention & control*; D014867:Water
D009125:Muscle Relaxants, Central; D014867:Water; D011803:Quinine