Since we already know in what angle people put their face when taking a selfie in different cities, we now also know how they sleep differently: Which Cities Get the Most Sleep? [wsj.com] by interactive graphics editor Stuart A. Thompson of the Wall Street Journal compares the sleeping habits of citizens of different cities.
On the topic of sleep, Jawbone also just released an interesting graph revealing how the recent Napa earthquake affected the sleep of local residents [jawbone.com]. Indeed, the distance to the epicenter seems to correlate to the number of people who awoke, and the time it took for them to get back to sleep.
As the visualizations are based on a vast dataset released by Jawbone, the makers of a digitized wristband that tracks motion and sleep behavior, the data is not necessarily representative for the whole general population.