Suggest Remedy For Frequent Night Walking

Hi, I am writing regarding my son for the last 18 months he has suffered with frequent night waking. from my observation and experience of it it does appear to be trapped wind. I have seen a allergist, who thinks its largely down to his prematurity. he was born at 26 weeks. but is 3 in Sept, syptoms are not as bad as last year. But I have taken wheat and most dairy out of his diet. He now has goats milk, cheese occasionally. He did come out on the scale for dairy with the allergy test but was so low the allergist said it should not affect him. He said also the fact he is slowly improving and not worsening is good. but with due respect to him, its not his son or himself that deals with this every night. Gripe water and gaviscone are used in combination. which mostly once the wind is up, he goes back to sleep, this can occur again though. Its started to happen in the day now, where as before it was mostly at night. We are waiting for a ultrasound requested by me. Not sure where to turn next as we still expericnce this every night. Help!?? thanks Janine