It's also clear that us humans are creatures of habit. The vast majority of people get up early on weekdays and sleep in on weekends and holidays. They're relatively idle while they're working in the middle of the day, but extra-active when commuting or heading out on weekend adventures. Yes, the data isn't all that shocking, and it's limited to people willing to snooze with $150 devices on their wrists. They may already be worrying about their sleeping patterns more than those who wear no tracker at all. Still, it's not often that you get to see the behavior of so many people modeled in such detail -- even if it really just serves as a reminder to lay off the caffeine at night.