I was a little harsh I suppose, but here's what he says:
"The #1 reason I decided to call it quits is simply that the rest of the world is monophasic. If most of the world was polyphasic, I probably would have stuck with it. Obviously when you go polyphasic, you fall out of sync with the way other people live. You’re awake most of the night while everyone is asleep. If you sleep like most people, then the hours you’ll gain from polyphasic sleep will come in the middle of the night. And as I gradually learned, nighttime hours are not the same as daytime hours when you live in a monophasic world."
"The #1 reason I decided to call it quits is simply that the rest of the world is monophasic. If most of the world was polyphasic, I probably would have stuck with it. Obviously when you go polyphasic, you fall out of sync with the way other people live. You’re awake most of the night while everyone is asleep. If you sleep like most people, then the hours you’ll gain from polyphasic sleep will come in the middle of the night. And as I gradually learned, nighttime hours are not the same as daytime hours when you live in a monophasic world."