Question: where does the sand in your eyes come from

title: Rheum
text: Rheum ( / ˈruːm / ; from Greek : ῥεῦμα rheuma `` a flowing , rheum '' ) , also known as gound , is thin mucus naturally discharged from the eyes , nose , or mouth during sleep ( cf . mucopurulent discharge ) . Rheum 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 . Rheum from the eyes is particularly common . Dried rheum is commonly called sleep , sleepy - seeds , sleepy buds , sleepy sand , eye goop , cheese , or sleepy dust . 

Answer: answer: Rheum is thin mucus naturally discharged from the eyes, nose or mouth during sleep. Dried rheum is commonly called sleep, sleepy-seeds, sleepy buds or sleepy sand.
answer: Rheum , also known as gound , is thin mucus naturally discharged from the eyes , nose , or mouth during sleep. 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 .