Dreamless sleep is much shallower, and we have all witnessed cats or dogs cocking their ears to a sound when apparently fast asleep.
无梦睡眠则要浅得多。我们都看到过猫和狗在显然的酣睡中，有一点响动耳朵就会竖起来。
Dogs and cats can actually curl up in a ball when they sleep. It is not necessary to sleep perpendicular to each other, stretched out to the fullest extent possible.
其实你们狗儿猫儿睡觉时可是盘缩成一团，所以你们完全没有必要横七竖八，伸手伸脚地睡成一摊。
Dogs and cats can actually curl up in a ball when they sleep.
其实你们狗儿猫儿睡觉时可是盘缩成一团。
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