This recent publication comes out of the lab of my graduate mentor. Adam, DG, and a group of undergrads sorted through the power grid of the Northwest Pacific which is easily and freely available online. After importing this data into Clocklab which is used in circadian research to track and collate daily rhythms of ResearchBlogging.orgbehavior (wheel running) and physiology (core body temperature), I present to you an activity record of humans in their natural habitat (in January).

You may be surprised to know (or not) that the length of the night becomes progressively shorter as the summer approaches and longer as winter approaches. I doubt this means that humans are going to bed earlier and waking up later– therefore getting more sleep–but perhaps this is true : )

At any rate, this is a really simplistic and cool way to think about human behavior and how lifestyle and climate shapes our environment. I wonder how different this power grid would be for Europe? Or Africa? You should know that this power grid data does not differentiate between city and rural areas.

humans in the wild, changes in light use

Stowie, A., Amacarelli, M., Crosier, C., Mymko, R., & Glass, J. (2014). Circadian analysis of large human populations: Inferences from the power grid Chronobiology International, 1-7 DOI: 10.3109/07420528.2014.965316