What makes Somnium by Robert Rich notable?

'Somnium' is notable for its extensive length, making it one of the longest continuous pieces in ambient music history. The album has been significant in promoting the concept of music as a tool for sleep and meditation, influencing both listeners and fellow artists in the ambient genre. It received positive acclaim from various publications, highlighting its innovative approach to sound design. In 2001, Robert Rich was established as a pioneering figure in ambient music, having already released several influential albums. 'Somnium' marked his return to long-form compositions, building on the foundation laid by his earlier works like 'Trances' (1994) and 'Rainforest' (1999). This album also showcases Rich's experimentation with sleep music, aiming to create an auditory experience suitable for relaxation and dreaming.