hormone melatonin

基本解释

The onset of sleep is triggered by two things: a decrease in body temperature and an increase in the production of the hormone melatonin.
诱发睡眠取决下列二个条件：身体温度的降低和荷尔蒙褪黑激素的分泌增加。
Turn off the TV and computer at least half an hour before bed; their lights can reduce your body's production of the sleep hormone melatonin.
在上床睡觉前至少半小时就把电视或电脑关闭，因为电子产品的灯光会降低体内睡眠荷尔蒙褪黑素的生成。
But they still need to know when to mate, pack on fat or thicken their coats. So they probably rely on an annual clock instead, set by the hormone melatonin.
即使如此它们也还是得了解何时交配、储存脂肪或是增加皮毛，因此它们依赖的可能是由荷尔蒙褪黑素调节的年钟。