Drink water while you drink or at minimum shortly thereafter before you go to sleep.
Take Omega-3 vitamins and antioxidant vitamins before you go to sleep or right after you wake up.
Wake and bake.
Have a banana milkshake.
Drink lots of room temperature water. Add lemon in it for Vitamin C.
Avoid caffeine and coffee while you're hungover, it'll just dehydrate you more.
Studies have shown that Prickly Pear Cactus extract can significantly help reduce hangover symptoms such as nausea.
One gatorade before sleep, another once you wake up! Works like a charm!
3 Words: 5 Hour Energy.
If you're hungover and wake up early in the morning force yourself to get up and have some water before falling back asleep. You won't regret it.