Insufficient sleep refers to not getting enough rest to function optimally during the day. Adults typically need about 7 to 9 hours of sleep per night, but many people fall short due to various factors like stress, work demands, or lifestyle choices. Chronic lack of sleep can lead to fatigue, difficulty concentrating, and mood changes. The effects of insufficient sleep can impact overall health. It is linked to increased risks of conditions such as obesity, diabetes, and heart disease. Additionally, sleep deprivation can impair cognitive functions, making it harder to make decisions and react quickly, which can be particularly dangerous in situations like driving.