RedBull is one of those energy drinks with Taurine...
..and I changed my sleeping and waking up times to see if I would both feel better and have more productive days. My theory was that I was oversleeping every day by a couple hours and that this was the reason I felt lousy all the time. I was drinking a few RedBulls a day but per my wife's request I cut that out, too.
....so far so good but I need more data before I make any conclusions
Brad