Consult a physician first.  Avoid afternoon nap and ask him for night walk after dinner to tire him and this could help

HELLO GET A COMPLETE EXECUTIVE HEALTH CHECK UP DONE AND THEN CONSULT A GOOD PHYSICIAN/PSYCHIATRIST AND DECIDE BYE

Hi there I understand your concern and anxiety...Exercise and stay active. Activity helps promote a good night's sleep. Get at least 20 to 30 minutes of vigorous exercise daily at least five to six hours before bedtime...Stick to a sleep schedule. Keep your bedtime and wake time consistent from day to day, including on weekends...Avoid large meals and beverages before bed. A light snack is fine. But avoid eating too much late in the evening to reduce the chance of gastroesophageal reflux disease (GERD) and improve sleep. Drink less before bedtime so that you won't have to urinate as often..if no improvements consult nearest physician for clinical examination they will do the needful.

Consult psychiatrist

Hello there.  I can understand your concern.  He has already been prescribed a medicine for his sleep and anxiety. Ask him to do yoga and meditation every morning.  Consult a psychiatrist in person for further evaluation and management.  Best regards. Dr. Anil kumar jain. Bangalore.

Hi.... Exercise and stay active. Activity helps promote a good night's sleep. Get at least 20 to 30 minutes of vigorous exercise daily at least five to six hours before bedtime... Avoid or limit caffeine and alcohol and don't use nicotine. All of these can make it harder to sleep. Avoid caffeine after lunchtime. Avoiding alcohol can help prevent restless sleep and frequent awakenings.... Stick to a sleep schedule. Keep your bedtime and wake time consistent from day to day, including on weekends.