Effect of creatine supplementation and sleep deprivation, with mild exercise, on cognitive and psychomotor performance, mood state, and plasma concentrations of catecholamines and cortisol. - McMorris, T.; Harris, R. C.; Swain, J.; Corbett, J.; Collard, K.; Dyson, R. J.; Dye, L.; Hodgson, C.; Draper, N. (Psychopharmacology, 2006)