Time of day, time awake and alcohol: the effects on fatigue and performance. The results of this study will clarify the effects of sleep deprivation and time of day on the experiences of fatigue and on performance. This information will have a direct impact on policy and practice relating to the management of fatigue. The results will have a direct impact on community safety, especially on the road and in the workplace. The study therefore has direct relevance for guidelines and regulations de ....Time of day, time awake and alcohol: the effects on fatigue and performance. The results of this study will clarify the effects of sleep deprivation and time of day on the experiences of fatigue and on performance. This information will have a direct impact on policy and practice relating to the management of fatigue. The results will have a direct impact on community safety, especially on the road and in the workplace. The study therefore has direct relevance for guidelines and regulations deveoped by bodies such as national and state road safety and workplace health and safety bodies.Read moreRead less