That crusty stuff in the corners of your eyes when you wake up—often called “sleep,” “eye boogers,” or “gunk”—is actually your eyes’ way of cleaning and protecting themselves. It’s made up of mucus, oils, tears, dead cells, and bacteria or their remains, all collected while you sleep.

During the day, blinking spreads tears and removes debris. At night, with no blinking, your eyes rely on tear components—like antimicrobial proteins and oils—to fight bacteria and keep the surface clean. The resulting mixture gathers and dries into the crust you see in the morning.

Neuroscientist Andrew Huberman and various eye specialists have highlighted how this discharge reflects a successful overnight defense. It’s not just gunk—it’s proof your immune system is doing its job.

**When to Be Concerned**:
Normal eye discharge is small, yellow or white, and dry. If it’s green, thick, persistent, or comes with redness, pain, or vision changes, it could signal an infection or other eye issue.

**Eye Hygiene Tips**:
– Gently wipe discharge with a clean, warm cloth.
– Wash hands before touching your eyes.
– Avoid rubbing your eyes.
– Keep contact lenses and makeup clean.

So next time you wipe away your morning eye crust, remember—it’s a sign your eyes were working hard to protect you while you slept.