Hello thanks for asking from HCM for your health related queries I can understand your concern. SIDS or severe immune deficiency syndrome doesn t usually present with symptoms like increased night sweats. Frequent infections and persistent fever etc are common symptoms. But the persistent sweating shouldn t be ignored because this could be the sign of some underlying thyroid disorder or anxiety. Get his thyroid function tests done to rule out hyperthyroidism. In hyperthyroidism individuals present with sweating, tremors and other symptoms of hyperthyroid states. Once thyroid abnormalities has been ruled out then other possible reason for his symptoms is anxiety. Get an appointment from a psychiatrist and get him evaluated for anxiety. Thanks, Hope this helps you. Take care Dr. Seikhoo Bishnoi Consultant Psychiatrist