This is completely normal and is your body’s way of clearing out buildup from sleep. However, if the discharge is excessive or accompanied by redness, itching, or burning, it could be a sign of an infection, like conjunctivitis (pink eye), which may need medical attention.

Huberman compares it to “casualties of a war” fought while you sleep, which might make you see it in a new light—your body is working hard to keep your eyes healthy!