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Eyes Wide Shut is a fairly faithful adaptation of Arthur Schnitzler's Traumnovelle (or Dream Story), but it omits one important piece of information that might serve as the key to understanding it. In Schnitzler's novella, Fridolin, the Bill Harford equivalent, is told by his wife that she began to fantasize about infidelity while they were on holiday in Denmark. When Fridolin goes on his strange journey and arrives at the masked ball, the password is "Denmark." Schnitzler does not resolve whether Fridolin's journey is a dream or is meant to be interpreted literally.
In Eyes Wide Shut, the password is changed to "Fidelio," a word that points at the theme of marital fidelity, but does not indicate clearly that Bill's journey might be a dream. Fidelio is also the name of the only opera by Beethoven, which tells how Leonore, disguised as a prison guard named "Fidelio", rescues her husband Florestan from death in a political prison.