He fell into a sleep so deep as to counterfeit death.

他睡着了，沉睡得像死了一样。

youdao

Una soon fell into a deep sleep.

尤纳很快就睡熟了。

《柯林斯英汉双解大词典》

Ros fell into a deep sleep.

罗斯睡着了，睡得很沉。

《牛津词典》

The very moment that she felt the prick she sank down into the bed that was right there and fell into a deep sleep.

NEWYORKER: Once Upon a Time

After three and a half days without sleep the woman fell into delirium, lifted her hand from the pickup and began clapping in praise of Jesus.

ECONOMIST: Pickup country