Ashton choreographed an "Awakening Pas de Deux" to this music (I believe for Peter Wright's 1968 production). No. 20 (The Awakening) was cut and instead No. 18 (Entr'acte) began after the tam-tam of No. 19 (Entr'acte Symphonique).
The pas de deux is really very beautiful and dramatically makes much more sense than the allegro awakening. I BELIEVE the pas de deux was created for Sibley and Dowell.