On this occasion, he had fallen at once into a dreamless sleep.
这一次，他立刻进入了无梦的睡眠。
He fell into a deep dreamless sleep.
他酣然入睡，一夜无梦。
I didn’t wake up until 4am the next day, and it felt like I was in a deep, dreamless sleep.
结果直到第二天早上4点我才醒过来。感觉这是一次很沉的几乎无梦的睡眠。
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。
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。
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