For a week now, I've been getting nausea at night. It's never enough to make me run to the toilet thinking I'm going to throw up, but it's really irritating. I have a white tongue as well. I heard that's a sign that your stomach isn't well. What I find puzzling though, is the fact that I'm almost always okay during the day, and out of nowhere I just start feeling sick at night. Going to the doctor is not really an option right now. Any help would be appreciated.