Hello thanks for asking from Health Care Magic Pachygyria is a congenital disorder with malformation in brain. It usually manifest as seizures, mental retardation, developmental delay. Your cousin is 3 years old and he is having sudden abnormal movements of extremities with rolling of eye balls and no loss of consciousness. Most likely these are partial seizures. He is on DAFOS for foot deformities. One thing that need immediate attention is his seizure. Repeated seizures may cause damage to brain neurones which will further potentiate the mental retardation. So control of seizures should be first priority. He has schedule of EEG and after making diagnosis he should be given anti-epileptic drugs. Drugs like Sodium Valproate, Carbamazepine etc are broad spectrum drugs and can be given to him with proper consultation of his doctor. Second if possible get his CT scan done to find out extent of brain damage. For sleep you can consult his sleep specialist. Provide him good care to prevent progression of disability. Thanks, hope this helps you.