Staying up late does not cause sudden death directly, but it is a trigger for individuals already suffering from certain diseases, reports Global Times.

It was already 1:30 in the morning and Yan Qing, 30, a programmer at an app company in Beijing, still had two more projects to finish. He zoned in on his keyboard and began typing intently. There was no time to notice anything else. The cans of red bull and black coffee cups strewn across his desk stand as a testament to his courageous efforts to keep his energy up and sleep at bay.

The imminent deadline and all the stimulating drinks he took made his heart pound. Yan started to feel short of breath, dizzy and nauseous, but he is used to it. He has felt like that every night for the past three years.