Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.

发红、发炎的皮肤可能会因诱发性食物、干燥的空气和压力而病情加剧。在高强度游戏期间，当身体处于持续的压力中时，会释放一种名为皮质醇的激素，这种激素会加剧全身的炎症，并引发湿疹。