Li Yu-chou points out, "When people sleep, their brains and bodies enter a state of high metabolic activity during which there is protein synthesis, cell division, and hormone creation. All are important for supporting immune functions and keeping healthy."
台大精神科醫師李宇宙指出：「人類在睡眠中，腦部與身體會進行蛋白質合成、細胞分裂、生長激素等新陳代謝活動，而這些都是維持免疫功能和人體生理恆定性的重要物質。」