The human circadian clock tells us when to sleep and awaken and controls important physiologies involving hormones, body temperature, heart function, and oxygen consumption.

• 人类昼夜节律生物钟告诉人们什么时间睡觉和清醒，并控制重要的生理机能，例如激素分泌、体温保持、心脏功能和氧耗量。