90 Mental Alertness Score(+/-SEM) o : 8 8 8 8 8 8 2 cups Decaffinated 2 Cups Regularly Caffeinated Intake Sleep Deprivation Status No Sleep for 12 hours 7 Hours of Sleep Participants that were not sleep deprived did significantly better when drinking caffeine, while participants that were sleep deprived did significantly better when not drinking caffeine. Participants that were not sleep deprived performed significantly better than participants that were sleep deprived. Participants that drank caffeine performed significantly better than participants that did not drink caffeine