The study by Pilcher and Huffcutt (1996) uses a meta-analysis to quantitatively summarize the effects of sleep loss on human functioning. The analysis includes data from 19 original research studies, totaling 1,932 participants. The results suggest that sleep deprivation strongly impairs human functioning, with mood being more affected than cognitive or motor performance. Partial sleep deprivation is found to have a more profound impact on functioning compared to both long-term and short-term sleep deprivation. The study highlights the potential underestimation of the effects of sleep deprivation in narrative reviews, particularly regarding partial sleep deprivation. The meta-analysis provides a comprehensive and objective assessment of the strength and consistency of the effects of sleep deprivation, contributing to a better understanding of its impact on various aspects of human performance.The study by Pilcher and Huffcutt (1996) uses a meta-analysis to quantitatively summarize the effects of sleep loss on human functioning. The analysis includes data from 19 original research studies, totaling 1,932 participants. The results suggest that sleep deprivation strongly impairs human functioning, with mood being more affected than cognitive or motor performance. Partial sleep deprivation is found to have a more profound impact on functioning compared to both long-term and short-term sleep deprivation. The study highlights the potential underestimation of the effects of sleep deprivation in narrative reviews, particularly regarding partial sleep deprivation. The meta-analysis provides a comprehensive and objective assessment of the strength and consistency of the effects of sleep deprivation, contributing to a better understanding of its impact on various aspects of human performance.