4 cups of coffee in a row don't do anything to me and adding more makes me asleep. I guess I am one of those for whom coffee is just one of ways to stay hydrate

4 cups of coffee in a row don't do anything to me and adding more makes me asleep. I guess I am one of those for whom coffee is just one of ways to stay hydrated and nothing else. Similarly alcohol, it doesn't affect my thoughts just coordination, I am not more open/brave/socially whatever with it. I guess I should be a monk...