Kendall Jenner reveals the mystery illness she suffers from in the upcoming Sunday, November 6, episode of Keeping Up With the Kardashians. The emerging supermodel has been dealing with sleep paralysis, a condition that causes temporary inability to move or speak while falling asleep or upon waking.

The Estée Lauder spokeswoman, 20, expresses her fear over the sleep disorder while talking to her mom, Kris Jenner, about work obligations.

“You have a week in Paris, Milan and then London,” Kris tells her daughter. 

“I don’t know if I’m going to be able to do that,” Kendall responds. “I can’t travel that much. I’m like, scared. I’m freaking out because of these f--king paralysis things. I’m scared to fall asleep because it keeps happening to me. It almost feels like my heart stops.”

Kris then explains to the camera that Kendall’s health issue is starting to interfere with her career.

“Kendall basically lives on an airplane,” the momager explains of the jet-setting model. “So the anxiety on an airplane and the sleep paralysis is a huge problem. Sometimes it’s been so bad that she’s been paralyzed from even getting on an airplane. I’ve had to get on a plane and fly from L.A. to London just to get her from London to New York! So it’s becoming a real problem.”

Kendall also suffers from Trypophobia. The KUWTK star revealed her fear of irregular patterns or small holes via her app in August.

“Trypophobics are afraid of tiny little holes that are in weird patterns,” she shared at the time. “Things that could set me off are pancakes, honeycomb or lotus heads (the worst!). It sounds ridiculous but so many people actually have it! I can't even look at little holes — it gives me the worst anxiety. Who knows what's in there???”

Watch the clip above. Keeping Up With the Kardashians airs Sundays on E! at 9 p.m. ET.

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