Often staying up late and not getting enough sleep can accelerate skin aging and cause skin sagging. Sleeping at night is the time when skin metabolism is at its peak, and skin cell division and proliferation peaks from 22:00 to 2:00 a.m. So the best time to go to sleep is before 22:00, try to keep 8 hours of sleep every day, which has an important role in the metabolic renewal of skin cells, and people who do not get enough sleep for a long time are prone to problems such as sagging skin around the eyes and dark circles under the eyes.