Lyric discussion by webmasterdee 

Cover art for Twilight lyrics by Electric Light Orchestra

I can't believe no one has commented on the greatness of this song! He's talking about a girl who just took his mind away and he can't stop thinking about her. He compares her to "twilight" - illusory, beautiful, supernatural, like a muse - hence the name of the song.

Here is my counter theory; Twilight is the technology (time travel wormhole perhaps, but it appears as twilight to us humans). He arrives in the future, meet by a robot version that looks a lot like his g/f Julie (from the cut track "Julie don't Live Here Anymore"). Somehow, he can communicate to his real Julie through dreams, or tries too anyway. He is not thrilled with Julie-bot and grows depressed

Our hero contemplates running away, maybe even killing himself with a ticket to the moon. He changes his mind and does not. Instead he...

@KProvance I'm not the only one who noticed the line "You stepped out of the dream, believing everything was gone" - which, to me, was the final giveaway. Interesting, though, Lynne has said he never established, in his own mind, whether it was all a dream or real - to the protagonist.