The benefits of music on sleep aren’t just spiritual, but based on empirical evidence, reports TIME.

By the time Middleton released Sleep Better, a once-derided field was gaining legitimacy and sprawling in many directions. In the experimental wing, Basinski and Rich were suddenly being asked to perform sleep concerts for thousands of horizontal fans at major festivals like Le Guess Who in the Netherlands and Moogfest in North Carolina. In an era of experiential pop-ups and events, consumers were embracing the opportunity to pay $250 per ticket for the privilege of falling asleep to Max Richter’s Sleep.