Spock's Beard, an American progressive rock band formed in Los Angeles, plays a brand of progressive rock with pop music leanings, drawing much influence from Yes, Genesis and Gentle Giant. The band is known for their intricate, multi-part vocal harmonies and use of counterpoint vocals.

The band was formed in 1992 by brothers Neal (lead vocals, keyboards) and Alan Morse (vocals, guitars), John Ballard (bass) and Nick D'Virgilio (drums). Brief Nocturnes and Dreamless Sleep is the eleventh studio album and was released on April 2, 2013.

It is their first album with singer Ted Leonard and drummer Jimmy Keegan in place of Nick D'Virgilio, while former member Neal Morse co-wrote two tracks, including "Waiting for Me", on which he plays guitar. The album has received positive reviews from music critics and has continued the return to progressive rock shown in its predecessors Spock's Beard and X