Circadian rhythms of performance: New trends

This brief review is concerned with how human performance efficiency change s as a function of time of day. It presents an overview of some of the rese arch paradigms and conceptual models that have been used to investigate cir cadian performance rhythms. The influence of homeostatic and circadian proc esses on performance regulation is discussed. The review also briefly prese nts recent mathematical models of alertness that have been used to predict cognitive performance. Related topics such as interindividual differences a nd the postlunch dip are presented.