Anyone else drink energy drinks even though caffeine has no effect on them?

So, caffeine has no noticeable effect on me. I’m sure it’s doing something, but I generally feel nothing. No energy, alertness, nothing. I never understood people saying they didn’t want to drink a Dr. Pepper too close to bed because it would keep them up. I can drink the strongest caffeine drink and then just take a solid nap. Despite this, I keep drinking them. I don’t even know why. Anybody else?