I'm a 21 year old female and for the past couple of weeks, I have been having excessive gas at night. It starts after I eat dinner and lasts until I go to bed. It's not uncomfortable by any means, it's beginning to concern me because it is very excessive. It comes every night without fail, and it's only at night, not during the day. I eat fairly healthy, and I don't have any other symptoms. What could be the cause of such excessive gas?