任何生物体都有决定自身生命节律的生物钟。人也是这样,体内生理某些特性、某些指数多呈周期性的变化。这一节律可以按天进行(比如人体适应昼夜交替变化)、按周进行(比如伤口的愈合大约需7天)、按月进行(比如妇女的月经周期)或按季节(比如季节性情感疲劳症患者表现出的情绪变化)甚至按年周而复始进行。 Any organism has a biological clock that determines its own rhythm of life. The same is true of people, some of the physiological characteristics of the body, some of the index showed periodic changes. This rhythm can be performed on a daily basis (eg, the body adapts to alternating day and night), on a weekly basis (eg wound healing takes about 7 days), on a monthly basis (eg, women’s menstrual cycle) or seasonally (eg, seasonal emotional fatigue The emotional changes that patients show are repeated even year after year.