If you're having a lot of trouble with reflux at night, then you need to let your doctor know. He/she will either move your dose to before dinner, or give you another dose...40mg AM and PM.
If you were to switch yourself to a night dose, you could take it in the morning, then before dinner as well on the day you make the switch. As Joy said, 40 mg twice a day is a very common thing.
Please contact your doctor and discuss your problems.
You shouldn't just live with it, without giving your doc a chance to help you be more comfortable.