There was a moment I know when I was under in the dark or something. Whatever I had been reduced to, not even consciousness, I was a vague awareness in the dark. I could feel my definition fading. And beneath that darkness there was another kind. It was deeper, warm, like a substance. I could feel, man. I knew - I knew - my daughter waited for me there. So clear, I could feel it. […] And all I had to do was let go and I did. I said, “Darkness, yeah!” And I disappeared. But I could still feel her love there, even more than before. Nothing, nothing but that love. And then I woke up.
Paul McCartney wrote this song alongside John Lennon’s swimming pool in Weybridge while waiting for Lennon to wake up.
"I sat out by the pool on one of the sun chairs with my guitar and started strumming in E, and soon had a few chords, and I think by the time he’d woken up, I had pretty much written the song, so we took it indoors and finished it up […] When I sang it in the studio I remember thinking, I’ll sing it like Marianne Faithfull; something no one would ever know… So that was a little voice, I used an almost falsetto voice and double-tracked it. My Marianne Faithfull impression." - Paul McCartney