Why reset your circadian rhythm? It’s all about the hormones baby! Light is the strongest mechanism we have for synchronizing our internal body clocks with the world around us. But our everyday lives, which are often spent indoors in dim artificial light, easily throw our natural circadian rhythm out of sync. This isn’t only affecting our sleep. Researchers have shown as many as 73 traits – from alertness to strength – wax and wane depending on the time of day. Our mood also seems to be affected