Hypnos was the Greek god of sleep. He was often depicted as a young man with wings and a poppy stalk in his hand.

Hathor was the Egyptian goddess of music, dance, and joy. She was often depicted as a woman with a cow's head.

The Guqin is a Chinese string instrument that has been used for centuries to promote sleep. It is said to have a calming and relaxing effect on the mind.

The Hurdy-gurdy is a medieval European string instrument that was often used to lull people to sleep. It is a crank-operated instrument that produces a continuous drone.

William Byrd was an English composer who wrote the famous lullaby "Hush, Little Baby". The lullaby was first published in 1591 and has been popular ever since.

Henry Purcell was an English composer who wrote the famous opera "Dido and Aeneas". The opera was first performed in 1689 and has been popular ever since.

Wolfgang Amadeus Mozart was an Austrian composer who wrote the famous symphony "Eine kleine Nachtmusik". The symphony was first performed in 1787 and has been popular ever since.

Frédéric Chopin was a Polish composer who wrote the famous nocturne "Nocturne in E-flat major, Op. 9, No. 2". The nocturne was first published in 1832 and has been popular ever since.

Claude Debussy was a French composer who wrote the famous prelude "Prélude à l'après-midi d'un faune". The prelude was first performed in 1894 and has been popular ever since.

Alban Berg was an Austrian composer who wrote the famous opera "Wozzeck". The opera was first performed in 1925 and has been popular ever since.

John Cage was an American composer who wrote the famous piece "4'33"". The piece is four minutes and thirty-three seconds of silence. It was first performed in 1952 and has been controversial ever since.

Terry Riley was an American composer who wrote the famous piece "In C". The piece is a continuous drone that can be played for any length of time. It was first performed in 1964 and has been popular ever since.

Brian Eno was an English composer who wrote the famous album "Music for Airports". The album is a collection of ambient music that is designed to be played in public spaces. It was first released in 1978 and has been popular ever since.

The Orb was an English electronic music group that wrote the famous album "The Orb's Adventures Beyond the Ultraworld". The album is a collection of ambient and psychedelic music. It was first released in 1991 and has been popular ever since.