I also stopped drinking red bull not long ago because it would mess with my sleep cycle. I would not be tired late at night and stay up way too late. Then I would not get enough sleep and start the viscious cirle to drink more red bull.

I decided to stop when I my heart started racing randomly (im closer to 30 than 40) sometimes so I visited the doctor and they basically told me to stop drinking energy drinks and sleep more.

I have tried before to lower the amount but if I drink energy drinks I always end up in that bad circle. That said I love red bull. I love the taste, how clear my head gets whenever I drink it etc but I cannot drink it anymore because it is very harmful for my health.