Is there a way to get several billion people to simultaneously decide to get up an hour early?
Of course there is — Daylight Saving Time.
At least twice a year (when clocks change, but also often between) I am amazed to see how easy it is. Nowadays with many timepieces being connected to the internet, there are probably a billion people who don't even notice it happen, but even when clocks all had to be manually set, everyone still did it when they were told to.
When the idea was first devised 150 years ago it must have been extremely difficult to envisage people actually doing this all at the same time. I still find it quite staggering. I can't think of any other examples of so many people doing something so unnatural by mutual agreement.