Stress?

Lately I've been feeling a bit nauseous during evening and especially when i go to bed. It can be that im stressed and im not getting enough sleep but i have no idea. I feel completely fine during the days up until around 8 or 9 pm. Its getting a bit frustrating since its affecting me falling asleep (which im already having trouble with). Google hasnt helped much either, i'll just wait it out and hope it goes away after a long nights sleep. Closing curtains and hoping for the best. Night night.