Sleep is an eight-and-a-half hour concept album based around the neuroscience of sleep by German-British composer Max Richter. It was released on September 4, 2015, accompanied by a one-hour version with variations, From Sleep, later remixed as Sleep Remixes. In April 2020, the documentary Max Richter's Sleep, directed by Natalie Johns, was released, and focused on Richter and Mahr's performances of Sleep in Los Angeles, Berlin, Sydney, and Paris. The original album was followed by subsequent related releases, including Sleep: Tranquility Base EP, a "faded" edition of Sleep, Sleep: Piano Edition EP, and Sleep Circle. From Wikipedia (https://en.wikipedia.org/wiki/Sleep_(...) under Creative Commons Attribution CC-BY-SA 3.0 (https://creativecommons.org/licenses/...)