Photo therapy, maintenance of sleep hygiene. Avoid spending more time in video
games, parties, loud music, watching horror movies etc. regular exercise, nutritious food etc will help him.
Psychotherapy can also help him to learn how to cope and deal with the various stressors in his life. Do not worry, follow the above mentioned methods and the symptoms will alleviate. I suggest you to consult sleep specialist or child psychiatrist. Take care and regards.