Lets examine circadian dysregulation and its effects on cognitive performance, as measured by the Psychomotor Vigilance Test (PVT). It explores the impact of factors like shift work and jet lag on circadian rhythms, detailing the resulting cognitive impairments and health consequences. The PVT's role in assessing these impairments and the controversies surrounding its different versions are discussed. Finally, the document explores strategies to mitigate circadian dysregulation, including sleep hygiene improvements, melatonin use, and behavioral adjustments.