Sometimes I was up very early (before 6). Other times, I woke up after 8. I did what worked best for us in our current circumstances and never cared what anyone else was doing. It doesn't matter what "they" are doing. What matters is if I am doing my very best at keeping priorities in check, at staying on top of my responsibilities, and at seeing progress in my children's academics.
I've been homeschooling since 1995 (22 years) and have three graduated children who are doing better than their peers in college and the workplace. My 16 yo will graduate high school in a month. My 14 yo will graduate high school before January. My oldest son is the sys admin over two industrial plants (since he was 21 years old) and bought his own home when he was 23 without any help from us other than opinions on the structure. My seven living children range in age from 25 to 9 yo. I am happy to say that all of them are also serving the Lord.
Homeschooling has built us a strong marriage, parent-child, and sibling relationships. There are SO many ways God has blessed us through homeschooling. I am very, very thankful He led us to this way of living.
Looking back over the years, I do not see where an earlier start time was of any benefit. It was the consistent and mindful effort that gave the results.
Interestingly enough, a friend of mine took a poll on wake up and homeschool start times a couple of weeks ago. Most of them woke up after 9 and started in the late morning hours. Most of them reported they did not make their beds because there were things of more lasting value to spend their time on.