They do for me too. Alcohol gives me a huge downer the next day but the party itself is amazing so I just waste the day after with a pillow over my head.

And I hate strict rules and rituals, I love chaos. So that also gets me down. I often stay up till 6am (the parties I mentioned above only start at midnight)

So yah it might make some people better but for me the times I break it are the ones that are exceptionally good.