  Our internal experience of time reflects what is going in the world around
us. Our body's natural rhythms get disrupted for a variety of external factors,
including exposure to collective events. We collect readings of steps, sleep,
and heart rates from 11K users of health tracking devices in London and San
Francisco. We introduce measures to quantify changes in not only volume of
these three bio-signals (as previous research has done) but also synchronicity
and periodicity, and we empirically assess how strong those variations are,
compared to random expectation, during four major events: Christmas, New Year's
Eve, Brexit, and the US presidential election of 2016 (Donald Trump's
election). While Christmas and New Year's eve are associated with short-term
effects, Brexit and Trump's election are associated with longer-term
disruptions. Our results promise to inform the design of new ways of monitoring
population health at scale.
