In a deep, immovable sleep.
I was dead asleep after my 12-hour shift; I didn’t even hear the neighbor’s car alarm going off!
Frequently Asked Questions (FAQs)
The idiom ‘dead asleep’ means “to deal with a difficult situation without being harmed or damaged”
Example usage of idiom ‘dead asleep’: Newspapers have weathered the storm of online information by providing news online themselves.