I get up at 4AM so I can be on the bike at 5. Back when I was doing the grad school thing and working with small kids I was on the bike by 4:30. I would be at work hr to hr and a half early to study. At end of work could cram in another half hour or so before home or class. Home by 6:30. Kids and I hit the hay about 8PM. System worked great until the dreaded 7-10PM one day a week class.