Student productivity is thought to fluctuate based on factors that include days of the week and individual differences. The purpose of the present study is to examine the effects of personality, day of week, time of day, and morningness/eveningness on productivity. To extend previous research, the present study evaluated productivity as well as the interactions between variables, thereby allowing for assessment of interaction effects. A survey research design was used in which daily surveys were administered five times a day (9am-12pm, 12pm-3pm, 3pm-6pm, 6pm-9pm, and 9pm-12am) for ten weekdays, Monday through Friday. Results show that productivity is lowest on Friday’s and that this effect was independent of morningness (i.e., no interaction effect) at all times of day.