It is about meeting in the middle. I had a job when I had to be in office at 9 and it was just a nightmare, because to get on time I had to wake up early and on

It is about meeting in the middle. I had a job when I had to be in office at 9 and it was just a nightmare, because to get on time I had to wake up early and only able to sleep 5 hours. Another job was more flexible and I was able to get in at 10. That meant over 6 hours of sleep for me. Imagine the difference between sleeping 5 hours every night or 6-7. This is a huge difference, by shifting things later by an hour. It wouldn't make a difference for morning person.