-Yang Seung-jo, 35, can live a normal life with just 3 hours of sleep a day. He spent the extra 5 hours he had left over for himself, and in the meantime, he was able to spend time with his loving wife and children, and with a great job and colleagues. However, when he woke up on his 36th birthday, his life was greatly distorted... **Original Webtoon:** [Lezhin](https://www.lezhin.com/ko/comic/sleepingman)
**Original Webtoon:** [Lezhin](https://www.lezhin.com/ko/comic/ssdj2002), [KakaoPage](https://page.kakao.com/content/55411162), [Bomtoon](https://www.bomtoon.com/detail/ssdj2002), [Naver Series](https://series.naver.com/comic/detail.series?productNo=5113853), [Ridibooks](https://ridibooks.com/books/4419003445)
**Original Webtoon:** [Naver Webtoon](https://comic.naver.com/webtoon/list.nhn?titleId=842675), [Naver Series](https://series.naver.com/comic/detail.series?productNo=13085813)
[Pre-serialization](https://comic.naver.com/bestChallenge/list?titleId=810198) **Original Webtoon:** [Naver Webtoon](https://comic.naver.com/webtoon/list?titleId=826887), [Naver Series](https://series.naver.com/comic/detail.series?productNo=11225187)