If it was selection bias like that, the same would apply to people in other cities, so it wouldn't explain the difference in the graph. My guess is people in Santa Cruz on average have a longer commute.
2. People who are technical (or are interested in quantified life in general)
Technical people who commute from SC to Silicon Valley have far less bus options and routes than SF (SC has three each way for Google which ends at 9:25). That forces a lot of the number 2 people awake earlier than they otherwise would be.
I think SC is probably the same, if not average getting up later than other Bay Area places, due to the large student population and short walk/bike commute for those who work in the town.
1. People who are fit (or want to be)
2. People who are technical (or are interested in quantified life in general)
Technical people who commute from SC to Silicon Valley have far less bus options and routes than SF (SC has three each way for Google which ends at 9:25). That forces a lot of the number 2 people awake earlier than they otherwise would be.
I think SC is probably the same, if not average getting up later than other Bay Area places, due to the large student population and short walk/bike commute for those who work in the town.