多年的科学研究发现想要睡觉的时候身体温度是关键，因为你在开始有睡意的时候身体的温度就在下降。
Years of scientific research have found that your body temperature is key when trying to get to sleep, as your body temperature naturally drops when you start to nod off.
催产素也认为有降低压力水平的功用，这可能又引起放松和睡意。
Oxytocin is also thought to reduce stress levels, which again could lead to relaxation and sleepiness.
海滩上正是黎明时分，我看见有东西突出海面，睡意朦胧中的我首先想到的是鲨鱼。
It was dawn on the beach and my first, sleepy thought when I saw something poking out of the sea was: shark!
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