Australians are the keenest social network users, spending more than 7 hours a month on such sites, according to a study.
一项调查显示，澳大利亚人最热衷社交网站，每个月花费在这些网站上的时间超过7小时。
It's no surprise, then, that more than half of American adults don't get the 7 to 9 hours of shut-eye every night as recommended by sleep experts.
因此，超过半数的美国成年人没有按照睡眠专家的建议每晚合起眼睛睡7到9个小时，就不足为奇了。
Researchers followed 68, 183 middle-aged women for 16 years and found that those who slept 5 hours or less per night were one third more likely to gain weight than those who slept for 7 hours.
研究人员对68183名中年女性进行了长达16年的“跟踪”调查，结果发现，每晚睡眠时间为5小时或不足5小时的女性发胖的几率比每天睡7小时的女性高三分之一。
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