John Lennon wrote this at a transcendental meditation camp in India when he couldn't sleep. He was meditating day and night, and after three weeks of meditation and lectures by Indian gurus he missed his soon-to-be wife, Yoko Ono, and came up with the song. The Beatles went on the retreat to study with the Maharishi. When it was over, Lennon thought it was a crock, but he wrote some good songs while he was there.
Vicky - LA, CA