First thing in the morning, any non-spicy food/snack that you'd prefer should do. Brush before you sleep so that you can eat before you get out of bed. The basic idea is to not keep your tummy empty as soon as you wake up. Any neutral food that will help soothe your stomach would be good. Avoid acidic foods 1st thing in the morning as they might make the experience of an unwanted nausea worse when mixed with your stomach acids.

Try taking nimbu pani... It helps .. any citrus fruit ..