Nausea every morning at 5 am, help!

does anyone know why my nausea almost has a schedule?? it's almost every single day at 5 am when it hits and will last for a few hours, usually I have to force myself to vomit (only if I know I'm going to and it's impossible to avoid) just to get it over with fast so I can get a few more hours of shut eye before school but and it's been making me loose sleep so much to the point I had to go on independent studies momentarily :( it is currently 5 am and I am taking a bath because of how bad it is right now unfortunately