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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。
youdao
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He fell into a deep dreamless sleep.
他酣然入睡，一夜无梦。
《柯林斯英汉双解大词典》
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It is dark like a sleep that is dreamless.
它沉黑得像无梦的睡眠。
youdao
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It is dark like a sleep that is dreamless.
它沉黑得像无梦的睡眠。
youdao