Nearly everyone has stayed up late and thought the next day that they aren't looking their best but scientists have now proven this with a simple experiment.
They sent their 23 volunteers to bed for a good night's sleep - 8 hours - and photographed them the next day. The following night their sleep was restricted to just 5 hours, 2 hours less than recommended, and they were photographed once more.
They were then rated on a 1-10 attractiveness scale by members of the public.
The participants were rated as less attractive and less healthy when they were tired than when they were well rested.
Scientists from the Surrey Sleep Research Centre believe that the effects of 'beauty sleep' could be even more pronounced if the photos had been taken at a different time.
"The photographs were taken during the daytime when the biological clock promotes wakefulness.
"Can you imagine how sleep loss makes you look at night or early in the morning when the circadian clock (body clock) promotes sleep?"
Fresh mind = fresh skin
Just as the night time hours are vital for reviving your mind, they are also important for your skin.
During the night your skin 'breathes' to rid itself of waste as well as repair any damage caused during the day.
By allowing yourself a good 8 hours a night for sleep and treating your skin to a nourishing night cream, you can give your skin a boost.
Try also sleeping on your back, rather than on your side. Resting your face on the pillow in the same way every night can lead to sleep lines. Over time, these lines become etched onto the skin and do not disappear when you get out of bed.
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