Young party-goers have long been mixing energy drinks with alcohol. While studies and media reports reveal the risks, a new breed of pre-mixed alcohol and caffeine concoctions are now on the market. According to Thomas Gould, associate professor of psychology at Temple, caffeine can allow someone to drink for longer periods of time. "In addition, caffeine and alcohol together may be more rewarding than alone. This could be due to both drugs producing increases in dopamine levels, which is involved in reward," he said.