by 
Anonymous
ANSWERS: 3
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Could be a lack of iron or something with your kidneys.
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According to the mighty Wikipedia, it could be hereditary: "In most people the dark circles under our eyes are blood vessels that we can see through the skin. The skin around our eyelids (periorbital skin) is the thinnest skin in the body (around 0.5 mm thick compared with 2 mm in other areas).[citation needed] Like varicose veins, dark circles under the eyes are usually an inherited trait. When blood passes through the large veins close to the surface of the skin it can produce a bluish tint. The more transparent the skin -- also an inherited trait -- the darker the circles appear. In people with a deep-set bone structure, shadowing contributes to the dark color under the eyes." http://en.wikipedia.org/wiki/Eyebags
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It may be the quality of the sleep not the amount. People with sleep apnea, like myself, often don't really sleep. Apnea is when the body stops breathing in your sleep, the brain gets deprived of oxygen then sends emergency signals to the lungs and heart to work to get air. When those signals fail, you wake enough to not get REM sleep but often not enough to know you woke. Talk to your Dr. if you have a sleep disorder, it can adversely effect your health in a number of ways, even kill you, if left unchecked. I hope you get it figured out.
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