麻豆社

A former marine spent ten days in a disused bunker to see how the human body reacts when we have no sense of time. Evolutionary biologist Ella Al-Shamahi and chronobiologist Vicky Revell say the experiment shows that "modern life is not great for us, we sit in dark offices and we don't get the natural sunlight we evolved for."

(Image: the cycle of sleep, credit: Science Photo Library)