Texts: Mark 1:9-15; Exodus 16:1-5; 13-26
Over the years I’ve watched my fair share of TED talks. One that left a big impression was also one of the shortest. It’s a talk by Jessa Gamble from way back in 2010 titled “Our natural sleep cycle is nothing like what we do now.” Rather than the standard 18ish minute TED talk, this one is only three minutes and 55 seconds.
Her talk goes something like this: Humans, like all other multicell organisms, plants and animals, have an internal clock. It’s part of our chemical make up, linked to the daily cycle of light and darkness. Humans evolved close to the equator, where days and nights are about equal, so our body clocks are most naturally equipped for this kind of cycle. But we’ve spread to every corner of the globe, where daylight and night time hours are not evenly split, and of course our modern world of abundant artificial light throws another curve at our sleeping patterns.
But we seem to have a fairly persistent body clock, even when we don’t know whether it’s night or day. Jessa Gamble cites studies of people having their watches taken away...