Kim Sung-won, better known by his stage name Sleepy (슬리피), is a South Korean rapper and a television personality. He is a member of the hip hop boy duo Untouchable. He released his solo debut single, "Cool Night", on June 16, 2015.
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In their own words 10
That was an overdraft on tomorrow - I know I need to pay it back with quiet and sleep.
Alexander Wright in Listening for a Lifetime, Hearing Health Foundation (16 December 2025)
Two Views of Sleep: Poetry by Martin Briggs, the Society of Classical Poets (September 1, 2025)
We’re operating a huge sleep experiment, worldwide, unlike anything anyone has ever done.
Philippe Kahn Fortune, June 29th, 2015, regarding the focus that Fullpower Technologies has on gathering and understanding sleep data.
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About this person
Kim Sung-won, better known by his stage name Sleepy (슬리피), is a South Korean rapper and a television personality. He is a member of the hip hop boy duo Untouchable. He released his solo debut single, "Cool Night", on June 16, 2015. He became a household name after appearing on reality TV shows like Real Man, I Live Alone, Law of the Jungle, and We Got Married.
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