It's most likely morning sickness. But try not to lay on your stomach which is probably a huge part of your problem. Get use to laying on your side which you'll have to do as you get bigger.
Try to dont lay down completely...it used to happen to me so i never did completely i was a little bit tired but i helped me so much
If it's only when you lay down and you feel fine otherwise it's probably just acid reflux!
I Was The same! Its Morning Sickness & U Can Get It Anytime Of The day, Even At Night!!
Probably morning sickness.