Are you having heartburn, acid reflux? Is it really hot where you are? Are you stressed out?
These could all be normal factors.
You might want to eat smaller meals and wait 3 hours after you eat before you go to bed. Try and stay away from heavy foods too for a while.
And, most impotantly, drink LOTS of water. Staying hydrated will help you digest anything you do eat.
Of course, I'm not a doctor. If you're extremely worried, go to one.
Good luck and feel better.