Simon Folkard

TL;DR: The evidence reviewed in this paper clearly indicates that both productivity and safety may be compromised at night, and shift systems need to be improved with respect to these factors.

TL;DR: The evidence did not support a direct link between circadian-related fatigue influences and performance or safety outcomes and further research is needed to clarify the link.

TL;DR: Results indicate that, in healthy young subjects, subjective mood is influenced by a complex and nonadditive interaction of circadian phase and duration of prior wakefulness, and the nature of this interaction is such that moderate changes in the timing of the sleep-wake cycle may have profound effects on subsequent mood.

TL;DR: In this article, a battery of selfreport questionnaires has been developed, which might usefully be employed in assessing the impact of different types of shift systems on large groups of individuals The scales included reflect the most pertinent issues within shiftwork research, and were chosen on the basis of being both relatively short, easy to administer, and having good psychometric properties.

TL;DR: It is concluded that it may prove feasible to develop a questionnaire that would predict the degree to which people's rhythms would adjust to shift work, and that flexibility of sleeping habits and the ability to overcome drowsiness should be components of such a questionnaire.