16/8 is eating as much as you usually would, but cramming it into an 8-hour period. I generally do all my eating from 11am - 7pm. It helps a little, and I'll take all the help I can get.
As for the sleeping, I'm usually zonked out by 9:30-10.
Intermittent fasting means that you limit the hours of the day that you eat -- in this case he's fasting for 16 hours of the day and allowing food intake for 8 hours.
I presume this means he has two meals -- a late dinner and an early breakfast.
Human growth hormone seems to be raised considerably after fasting for 16-24h which in turn supports strength training right after this period as the muscles grow naturally faster without any kind of "funny" supplements intake. Basically a body hack.
You can go to sleep earlier. I go to bed at 9pm (except Friday+Saturday) and don't set an alarm. Moving my side project work to first thing in the morning instead of late at night has more than doubled my productivity.
As for the sleeping, I'm usually zonked out by 9:30-10.