Keep your alcohol consumption way below 4 units. For reference, a glass of wine is right around 1.5 units. A pint of beer is already pushing it at 3 units. Going beyond this will definitely leave you crashing and burning the next morning.
Your body feels like crap and so does your head. We can thank dehydration for that. Hence, you’ll want to restore some electrolytes to get your energy levels back up again. Gatorade, Lucozade Sport and Powerade do well to replace any lost sugars.