Hello, Your dad takes Vasograin tablets, it is commonly given to treat and prevent migraine headaches. It contains caffeine that stimulates your brain to uplift your mood and give you a feeling of well being by improving your energy levels. Sleeping in wrong posture causes neck spasms, herniated disc, migraine, spondylosis, triggers headaches and migraine, nerve impingement, pinched nerve, neck sprain, etc. He should avoid poor posture, such as slouching or head tilting, emotional stress, etc. He should maintain correct posture while sitting, standing or sleeping. Insufficient blood flow to the brain is caused mainly due to insufficient physical activity, obesity, age, hypertension, smoking, congenital heart problems, atherosclerosis, etc. He is suggested to get clinically examined by an Orthopedics, get X-ray neck done to detect cervical problems so that treatment can be started at the earliest. If required he may have to get CT, MRI, few blood works done. He will be treated accordingly. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician