Ans. Lack of sleep can lead to puffy eyes due to fluid retention, blood vessel dilation, and inflammation. Insufficient sleep disturbs the natural equilibrium of fluids in the body, leading to the accumulation of fluid around the eyes, which can cause puffiness and swelling. Sleep deprivation also leads to the expansion of blood vessels, increasing blood flow and fluid buildup in the under-eye area. Furthermore, it triggers inflammation, causing the skin around the eyes to appear swollen. Getting enough sleep is crucial to allow proper fluid regulation, reduce blood vessel dilation, and minimize inflammation, helping to prevent or alleviate puffy eyes.