So, at his NYC show, he basically explained this song. I wish I had a recording of it so I could transcribe, but you'll have to rely on my memory - I will just try to summarize the jist:
Amie is a friend of his, and he hadn't seen her in a long time, but he found himself single at the time, and went to visit her. When he was there, they hit it off, and she invited him to stay (overnight), but apparently only as a "you can sleep here" kind of thing (too much wine? not sure). Anyhow, he talked about how she led him to the guest room, and then went to bed. He talked about lying there for hours wishing / imagining that she would come to him in the night . . . but she didn't, and he alluded to some form of self-gratifiication (which was hilarious), and then I think there was like a big picture window, and some kind of beautiful view inspired him as he lay there, and then he wrote it.
Anyone else who was there, and remembers, please extend/correct this. But, that is pretty much my memory of it. hehe
(not quite as inspiring as some of the theories, but it's real life, and I love it)
Benjamin