There’s a whole ‘war’ that goes on with our peepers during our snoozing.

There is truly no greater joy than getting into bed after a long day at work, drifting off to the land of nod.

However, waking up the following morning is not so fun, especially when you drag yourself out of bed, take a peak in the mirror and find a load of gross yellow goop in the corners of your eyes.

It’s a pretty universal experience, yet while we’re all used to just wiping it away and pretending that the human body isn’t totally disgusting, not many of us really know what that ‘yellow sleep’ actually is.

After a TikTok user shared the truth behind why we get it, people have been left in sh0ck.

“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 kind of gross.”

He continued: “That’s actually dead bacteria that your eyes have successfully defeated during your night’s sleep.

“So when you wipe those away, you’re taking the casualties of a war that you won during your night’s sleep and you’re whisking those away.”

Yep, the eye produces a small amount of oils and mucus to stay moist and, as you don’t blink when you get some shut-eye, the discharge can collect in the corners.

It can take a variety of different forms with the most common being crusty, sticky, thick, thin, white, clear, or slightly yellow.

People were mind-blown when they found out the reason behind the crust, taking to the video’s comment section to share their thoughts.

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