Understanding the phrase "fell sound aleep"
Hi everybody.
I'd like to ask those, who are native English speakers, about the phrase "fell sound asleep".
Firstly I met this phrase in the Bibile. It's written in Acts as: "I was in the town of Joppa and was praying when I fell sound asleep and had a vision." So, I couldn't translate and understand this phrase and just look at Russian version of the Bible. But I'd like to know examples of using this phrase between those who speak English. And please explain me the meaning of this phrase.
And of course, correct my English in this question))))