Why do we have energy in the mornings?

I am on my journey of not drinking anymore but I have some questions.

Every night that I would get shitfaced, I’d wake up with a bunch of energy. I would have a head ache but could talk someone’s ear off. I would drive and shop and be so happy…until the afternoon. Id puke and just lay in bed feeling like shit. Why is this? Why a rush if energy at all?