Avoid chocolate, tomato products, highly acidic foods, orange juice, excessive spicy foods hours before bed.
Stay more propped up while you sleep.
Take a Ranitadine tablet or two after a meal with any of the foods mentioned above.
Double up your Omniprazole so it's more prescription strength.
Cutting down on stress is always helpful......my wife actually got a new job to help reduce stress that caused reflux.....worked wonders.