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Well-rested skin looks plumper, feels supple and hydrated and has a brighter tone too, making you appear younger. A lack of sleep - even a few nights - can give you dark circles, dull skin, puffy eyes and less elastic, more wrinkled skin.
During the day, your skin has to work hard to fight off environmental aggressors such as sunlight, pollution, cold winds and harsh central heating. At night, when you sleep, your skin gets a break and can concentrate on the job of repairing and renewing its cells and tissues.
While you sleep, your skin is busy processing nutrients, renewing dead cells and getting rid of toxins and waste.
Your skin cells renew themselves at a faster rate during the night, and production of collagen is boosted, too.
Your skin is made up of two layers. The epidermis is the top layer and the dermis is the lower one. The stratum corneum makes up the surface layer of the epidermis, which is the visible part of your skin, and its job is to keep moisture locked in and germs, dirt and pollutants out.
The cells in the top layer are the oldest cells in the skin renewal cycle and are shed from this layer. The process of skin cell renewal is continuous and takes 28 days to complete. The newest cells from the lower layers gradually make their way to the stratum corneum, where they are shed.
There are no blood vessels in the epidermis. Skin relies on a supply of blood cells in the dermis for oxygen and nutrition, plus removal of toxins.
The skin's support system, which gives it strength and suppleness, is in the dermis. It's here you find collagen and elastin fibres. Collagen is a protein and gives our skin strength, while elastin fibres keep it supple and elastic.
If you regularly don't get enough sleep, your skin can look prematurely aged. A study found that poor sleepers were less able to recover quickly from sun exposure and their skin was more dehydrated than those who slept well.
A Swedish study found sleep-deprived people had dark circles, swollen eyes and eye bags, as well as more sallow and drier skin.
Another study found poor sleepers showed more signs of ageing, including fine lines, uneven pigmentation and less supple skin. Researchers concluded that poor sleep quality can speed up skin ageing and weaken the skin's ability to repair itself.
Skin under our eyes is thinner than on the rest of our face, and this thins further with age. Lack of sleep can accelerate this and accentuates darker skin pigment under our eyes.
If you're aged between 18 and 65, seven to nine hours sleep a night is recommended to allow skin to repair and rejuvenate. If you're over 65, seven to eight hours sleep should be enough as your need for sleep drops as you get older.
Nothing beats a healthy, balanced diet to provide all the nutrients we need. But when this isn't possible, supplements can help. This article isn't intended to replace medical advice. Please consult your healthcare professional before trying supplements or herbal medicines.