Rough Trade says:

One of Britain's leading contemporary composers, Max Richter, has written what is thought to be the longest single piece of classical music ever to be recorded: Sleep. It's an eight-hour lullaby that is intended to send the listener to sleep. The landmark work is scored for piano, strings, electronics and vocals - but no words. It's his personal lullaby for a frenetic world. A manifesto for a slower pace of existence. This release is a one hour adaptation of the full work and is called From Sleep.

Richter has most recently enjoyed acclaim at the Royal Opera House in London for his "lavishly atmospheric score" for Wayne McGregor's ballet Woolf Works. Influenced equally by post-rock, classical music and the electronic avant-garde, he has composed and released five solo albums and 'recomposed' Vivaldi's 'Four Seasons' for a best-selling album in 2012.