Sleep in your eyes is also sometimes called sleeping sand, a soup eye or eye sore. But what is it?
In the corner of your eye is the plica semilunaris, a mucous membrane fold in the inner corner of your eye where two tear points meet. At night moisture is secreted, but there are also things that are not properly drained during the day:tiny grains of sand, pollen and skin cells, for example. The secretion is thicker than tear fluid, so it dries up in the corner of your eye, creating sleep. If you have enough tear fluid in your eyes, sleep will be moist and sticky. if you suffer from dry eyes, sleep has a grainy structure.
