My wife wants me to have a fixed time for starting and finishing work every day. The trouble is that I don’t have a set time for leaving the work desk. Nor is there much distinction between weekdays and weekends.
From the article: "Regardless of what I was doing I had to be home by 7pm."
As for sleep. I get about 5-6 hours. I wake up at 7am, at the latest, on weekdays to get the kids to school. On weekends I'll get more sleep (like midnight to 8 am).
It works for me.