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- 问题详情：Astrangethinghappenstonearlyeverybodyatnight.Theyturnoffthelights，pullupthecoversandclosetheireyes.Sixorsevensleepinghourslater,theywakeupagain.Strange,isn'tit?Sleeppuzzlesscience.Scientistsanddoctorswouldrathertalkaboutwhyonecan'tfallasleep...
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