<unk>  from a cat's eyes<unk>  (; from Greek: ῥεῦμα<unk> a 'a flowing,<unk> ') is a thin mucus naturally discharged from the eyes, nose, or mouth, often during sleep (cf. mucopurulent discharge).<unk>  dries and gathers as a crust in the corners of the eyes or the mouth, on the eyelids, or under the nose. It is formed by a combination of mucus (in the case of the eyes, consisting of mucin discharged from the cornea or the conjunctiva), nasal mucus, blood cells, skin cells, or dust.<unk>  from the eyes is particularly common. Dried<unk>  near the eyes is commonly called sleep, sleepy-seeds, sleepy buds, sleepy bugs, sleepy sand, sleepy winks, eye boogers, eye goop, sleepy dust, sleepies, eye gunk, eye crust, sleepy men, crusties, dozy dust, or sleepy dirt. When the individual is awake, blinking of the eyelid causes<unk>  to be washed away with tears via the nasolacrimal duct. The absence of this action during sleep, however, results in a small amount of dry<unk>  accumulating in corners of the eye. A parent or pet owner may notice the collection of<unk>  on children and pets they care for.
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