Yes, lack of sleep can cause dark circles under the eyes. The skin around the eyes is thin and delicate, and when we don't get enough sleep, blood vessels under the eyes can dilate, causing the skin to appear darker. This can create the appearance of dark circles. In addition, lack of sleep can cause the skin to become dehydrated and dull, which can make dark circles more prominent.
When we sleep, the body goes through a process of repair and regeneration, including the production of collagen and elastin, which help to keep the skin firm and supple. When we don't get enough sleep, this process can be disrupted, leading to a breakdown in collagen and elastin fibers. This can cause the skin to become thinner and more translucent, making blood vessels more visible, and contributing to the appearance of dark circles.
Furthermore, lack of sleep can also lead to fluid retention in the body, which can cause puffiness under the eyes, making dark circles more noticeable. Lack of sleep can also cause stress, which can lead to increased inflammation in the body, causing the blood vessels under the eyes to become more prominent.
In short, lack of sleep can cause dark circles under the eyes through a combination of increased blood flow, thinning of the skin, dehydration, fluid retention, and increased inflammation. Getting enough sleep and practicing good sleep hygiene can help to reduce the appearance of dark circles under the eyes.