Daytime sleepiness is a research area that focuses on understanding the causes and consequences of excessive sleepiness during waking hours. This condition can be a result of various factors, such as sleep disorders, inadequate sleep, or medical conditions. Researchers study the impact of daytime sleepiness on cognitive function, job performance, and overall health and well-being. They also investigate potential treatments and interventions to improve sleep quality and reduce daytime sleepiness. This research area is important for identifying and addressing sleep-related issues that can have significant impacts on daily functioning and quality of life.