He fell into sleep with all the Windows open.

所有的窗户都开着，他就睡了。

youdao

At night, he fell into sleep because of extreme sleepiness and exhaustion. His arms still thrashed mechanically. His hands smacked the water surface and he would awake and continued to swim ahead.

夜里，他因极度困倦睡着了，手臂还在机械地划水，手拍到水面上，人惊醒了就继续向前游。

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》

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

Too exhausted to do anymore, we fell into them and went to sleep.

CNN: Digging in with the Marines

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