“Since they don’t get up till noon, what difference does it make? ;)”
The average start time for office work in SF and Silicon Valley is 0700. About 1/2 arrive by 0600.
Wow. I knew a few who came in at that time but most professionals I worked with rolled in between 8 and 9. The other end of the day was a different story with a lot of us still in the office at 7pm.
Personally I often came in later after spending a good chunk of my morning worked remotely on my computer. All that mattered was that I was in attendance for important meetings. Only operations, which ran 24/7 scheduled meetings before 9AM. The most productive work was done after 5PM when the formal meetings were all over.