Every one of the little angels sound asleep in bed.

每个小天使听起来都在床上睡得很香。

youdao

He was lying in bed, sound asleep.

他正躺在床上，睡得很香。

《柯林斯英汉双解大词典》

He was sound asleep on top of the covers.

他在床单上睡得很香。

《柯林斯英汉双解大词典》

Some of you are sound asleep, deep in delta.

有些现在正蒙头大睡，就是δ波。

耶鲁公开课 - 心理学导论课程节选

Every weekday when most of us are still sound asleep, they assemble for another sortie, ready to take away what we throw away.

BBC

Hours earlier, Fifi was sound asleep in her crate, a red rabbit stuffed toy at her paws, looking like the most docile dog in the world.

WSJ: Banana Joe the affenpinscher wins Westminster

He was under a cupboard, sound asleep, and one had only to sniff at him to understand that he had wandered thirsty from bed to the kitchen and drunk at length from the wine bowl instead of the water bowl, and perhaps had had a solitary toddling drunken party all his own before hiding himself away to sleep.

NEWYORKER: A Tiny Feast