<s>[INST] I was lying in bed and when I moved to get up, my left locked up completely. I couldn t bend my knee or walk on it for a while. Taking small steps and walking (hopping) around for about 10 minutes, it finally went back to normal, but it frightened me very much. Do you know what could have caused this or what I should do about it? [/INST] Hi, Oh... too much tone... Good question. without an exam, I can only give general information and restless leg affects about 1 in 3 people. While it can be from medication, electrolytes, too much work on one side, mostly the cause isn't found and either medication for Parkinson's or muscle relaxants work well. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Matt Wachsman, Addiction Medicine Specialist </s>