Heredity-rather than too little sleep-is the real culprit of dark circles and undereye bags.The undereye ‘circle’ is caused by blood vessels under skin while undereye bags are actually small pouches of fat just under the skin.The skin in the eye area is the thinnest on the body;sometimes these veins show through,especially as me ages and as one’s skin becomes even thinner through the breakdown of elastin tissue.Undereye circles can also be symptoms of allergies that cause blood vessels in the nasal/eye area to dilate.If the circles are accompanied by symptoms such as swelling,congestion,or pain,see a physician.Undereye bags are actually small pouches of fat just under the skin. Fatigue can make both more obvious but logging extra hours of sleep cannot banish undereye bags and circles ,it can only alleviate the puffiness.Makeup coverage is the best way to conceal circles and bags; use a cream concealer a shade lighter than your foundation or try one in a blue tint–it casts shadows away from the face.