Sleep Problems

My son is almost 9 months old. He has never been a good sleeper, but, now it is getting worse. He is restless every night from at least 1-4 am. The dr. said his throat looked as though he had reflux even though he had the upper G.I. and it only showed some delayed emptying. She started him on 30 mg of Prevasid once a day. But from what I have read from other posts this should be broken down to 2 or 3 x a day. My question is what can I do at night to settle him down more? He wakes for a bottle around 1 am and then it is hell for at least 3 hours. Nothing I do calms him down. He will sleep in 15-30 min. intervals until around 4 am then he goes to sleep until 6-7 am. Please help!