Psychiatry A person laughs to a joke, then suddenly loses tone of all muscles. Diagnosis is: DNB 09; JIPMER 13 A Cataplexy B Catalepsy C Sleep attack D Sleep paralysis 💡 Explanation A person laughs to a joke, then suddenly loses tone of all muscles. Diagnosis is: DNB 09; JIPMER 13 ✓ Correct Answer: A. Cataplexy