A study of the effect of high-sugar, low-caffeine "energy drinks" on tests of attention done at Londonborough University in England. The finding was that so called "energy drinks" containing high sugar content do not appear to be effective in maintaining attention. "Sugar rushes" from such drinks don't appear to be very effective at overcoming sleepiness, write Clare Anderson, BSc, Ph.D., and colleagues in Human Psychopharmacology.