My 2 Year Old Baby Gets Uneasy Every Night After

My 2 year old baby gets uneasy every night after roughly 4 hr of sleep and remain so for another 2/3 hr. He feels comfortable on rubbing the back. He is fit and active otherwise no problems. Any suggestion? We suspect it could be what we call acidity in adults. Our peditrician prescribed junior lanzol but of no use it seems. Please help.