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每个人的生理状况,决定了他所需要的睡眠时间。真的能不用闹钟,每天都自然醒来吗?当然可以,只要遵循简单的方法:每天晚上都睡得饱饱的。
The physiological condition of each person determines the amount of sleep he needs. Really can not alarm, every day naturally wake up? Of course, just follow the simple method: sleep well every night.