Every morning, it’s the same scene: you look in the mirror and discover these small yellowish deposits at the corners of your eyes. Unsightly, right? But where do they really come from? Are they just a sign of fatigue or a warning signal from your body? Don’t worry, the truth is much simpler (and more natural) than you think…

Why does this yellow crust form when you wake up?

We colloquially call it “sleep,” or sometimes “chassie,” or even “crust” (yes, we see you smiling). Behind this small, harmless mass lies a real cleansing mechanism that your body organizes during the night.

This deposit is made up of a mixture of mucus, sebum, dead cells, and… neutralized bacteria. Yes, your eyes fight a little nighttime battle against impurities and other micro-intruders. Because your eyelids remain closed during sleep, this little world doesn’t have the chance to be evacuated naturally by blinking. Consequently, upon awakening, you find that infamous residue in the corners of your eyes.

But where does that yellowish color come from?

The yellow hue isn’t accidental. It’s mainly due to the presence of dead bacteria that the immune system eliminated overnight. It’s a bit like your eyes proudly displaying the results of their daily victory over invaders.

Neuroscientist Andrew Huberman likes to compare these residues to the “remnants of a silent war” fought during sleep. A powerful image, but one that pays tribute to the hard work your body does to keep your eyes healthy.

When should you worry? Symptoms to watch out for.
While that light morning discharge is completely normal, there are some symptoms that should still get your attention. Excessive discharge or associated symptoms, such as:

Red eyes,
persistent itching,
burning,
swelling of the eyelids,
… may indicate the presence of an infection such as conjunctivitis (also called “viral conjunctivitis”).

In this case, it’s best to consult a doctor for an informed opinion and, if necessary, appropriate treatment.
How can you reduce these deposits on a daily basis?

Although this phenomenon is natural, some simple measures can help reduce the accumulation of these small deposits after waking up:

Maintain strict eye hygiene: Gently clean the area around your eyes with a cotton pad soaked in warm water every evening.
Always wash your hands before touching your eyes: this is a necessary reflex that limits the entry of bacteria.
Use artificial tears when necessary: ​​to relieve dry eyes and promote the natural elimination of impurities. Change pillowcases and towels frequently: these fabrics in contact with your face can harbor unwanted microbes.
Single final sentence.
The next time you see those small yellow deposits at the corners of your eyes, think of them as a subtle sign that your body has been working to protect you overnight.