A man who’s been sleeping for only 4 hours for 15 years

(1)in the 15th year since
(2)I sleep for four hours
(3)Kim Ssang-gyu, 52-year-old sleep master
(4)I don’t have any problem even if I sleep for 4 hours

(1)Professor Shin Chul. The first difference in the Department of Respiratory Medicine at Korea University Medical School is that this person doesn’t wake upOnce you fall asleep, you never wake up Waking up
(2)If you look here, the 90 minute cycle goes around when you sleep. You never wake up

(1)If you look here, the 90 minute cycle goes around when you sleep. You never wake up
(2)Kim Sangkyu has a very efficient sleep
(3)For this person, it takes 2 hours
(4)You might think that 3 hours of sleep is enough

(1)It’s not how long you sleep
(2)It’s important how you sleep