Sleep variability refers to the natural fluctuations in the duration, timing, and quality of sleep that individuals experience over time. This research area focuses on understanding the factors that contribute to variability in sleep patterns, such as genetics, environmental influences, and lifestyle choices. Researchers also study the impact of sleep variability on health outcomes, cognitive function, and overall well-being. By examining the causes and consequences of sleep variability, scientists aim to develop strategies for improving sleep quality and promoting better health outcomes.