Change from an 8-hour shift to a 12-hour shift, attitudes, sleep, sleepiness and performance
Diurnal trends in mood and performance do not all parallel alertness
Effect of bright light at night on core temperature, subjective alertness and performance as a function of exposure time
Effects of alternating 8- and 12-hour shifts on sleep, sleepiness, physical effort and performance
Three-process model of supervisory activity over 24 hours