Formed by John Zewizz around 1980, Sleep Chamber has had a wide assortment of members, and performed a wide variety of music. Very early works were very experimental in nature, with elements of musique concrete. Shortly thereafter Sleep Chamber was recording ritual/ambient music, which continued into the early 1990s. In the mid-1980s the band also began working with more electro/EBM material, often meshed with their ritual works. This trend generally continued and took on additional rock-oriented dimensions in the 1990s. Around 2000 the project became effectively silent, but in February 2009 Sleepchamber (new spelling) are back with brand new albums.