Robert Rich is an influential ambient musician and sound designer based in California, who began releasing ambient music in the 1980s. He is perhaps best known for developing the concept of “Sleep Concerts”, special events lasting throughout the night which aimed to influence REM cycle sleep with auditory stimulus. Audiences usually slept through the events in sleeping bags, listening to music in affected states of consciousness, waking up to a piano solo and tea served by Rich. His 7-hour album “Somnium” was released in 2001, attempting to recreate the sleep concert environment. The Unsound Sleep Concert is the first chance to participate in such an event live in many years, and will take place in the communist-era Hotel Forum.