So will long naps,although short ones (20minutes or so) to pay back sleep lost the night before or in anticipation of a late night are O.

• 长时间午睡也是如此。而短时间午睡(20分钟左右)，对于补偿前一天所欠缺的睡眠和当天晚上准备熬夜所欠缺的睡眠，则是有益的。