I think I've discovered something.

I didn't have jet lag this trip. Usually, when traveling east I have a terrible time getting up and going to sleep when my body thinks it's two hours too early. I've been surprised how easy it's been to get up when my body should think it's 5 am. Maybe that's because on this trip I drugged myself into submission, sleeping at least 5 hours during the trip on Sunday.

Voilá! No jet lag!