A long while ago I asked someone the reason why he decided to quit his business at the time during his middle-years. His respond was because he wanted to stop waking up at 3AM in the morning, thinking about what had been left undone. I said, with a satisfying tone in my voice, that was why I did not choose to pursue business study in the first place.
But guess what?
Love do the same to you, too.
The only difference is things that pour into your brain in the middle of the night are memories and longing, what were done and what might have been.