Jet lag – the disadvantage of having a clock in the modern world

Air travel challenges our bodies in a way that has never before been encountered in our evolutionary history. It allows us to move rapidly across multiple timezones, quicker than we could have ever moved by foot or animal. Unfortunately, our bodies are unable to adjust quickly enough. We are constrained by our circadian clocks, the things that give our bodies a sense of internal time, which have evolved to coordinate our physiology to the rhythmic and predictable changes in the external environment (as well as other roles) like day and night. The clock keeps its original time when you move timezones like a watch before you’ve reset it. It’s resistant to rapid change, giving us jet lag. However, unlike a watch, the body clock can gradually reset itself over a period of days so that we become tuned to a new local time. Despite this inbuilt mechanism, in an era of global travel it is often too slow.

Is it possible to speed up the resetting process? Can we travel the world without jetlag?

Maybe.
Continue reading “Jet lag – the disadvantage of having a clock in the modern world”

Circadian clocks in the great outdoors

We’re all aware of our natural body clock pattern: some people are early birds, some people are night owls, a phenomenon known as your chronotype. You can override this with alarm clocks and coffee, which is especially important for shift workers. But have you ever noticed your chronotype shift when you go on holiday, especially when you holiday in the great outdoors?

Researchers from the University of Colorado wondered exactly that and described in 2013 interesting findings on the influence of natural and artificial light on human circadian clocks. Continue reading “Circadian clocks in the great outdoors”