An incredible condition that sees a Chinese man sleep for six months of the year and stay awake for the rest of it has puzzled doctors.
Li Zhiming's family has to look after the 74-year-old throughout the entire time he's asleep.
They said that they have to make him sit and feed him warm soup.
"When he is sleeping it is like he is in a coma," the Sun quoted Fu Yip, his daughter-in-law, as saying.
"We can't rouse him at all - if we put spoonfuls of soup in his mouth he swallows automatically but otherwise there's no response.
"Then when he wakes up he doesn't sleep for six months - wandering around the streets at night to amuse himself or watching television," she added.