"If you have ever woken up in the morning and you have some crust on your eyes," Andrew Huberman explained. "And you know that crust, that kind of yellowy stuff, sometimes it's yellow, I know this is ...

Read more Revolting truth about yellow stuff in your eye when you wake up You might see more gunk collected at the edges of your eye if the water from your tear film has evaporated Andrew Huberman ...

Eye crust can look a bit different for everyone, adds Sonia Kelley, O.D., M.S., medical reviewer at All About Vision—it can be yellow, crusty, clear, sticky, or thin and watery.