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Discover LudwigThe phrase "in a deep sleep" is correct and usable in written English.
You can use it to describe someone who is deeply and soundly asleep, or to suggest a state in which someone is completely unconscious or unaware for a period of time. For example, "The old man slept in a deep sleep all night without waking once."
Exact(44)
I was in a deep sleep.
She was in a deep sleep, breathing on a ventilator.
He stood for a long time and watched her breathe; she was in a deep sleep.
"I must have been in a deep sleep," Mr. Dudee said.
In the next bed, a girl, 12, lay in a deep sleep.
The condemned person is first injected with an anaesthetic to put him in a deep sleep.
Similar(16)
I had fallen into a deep sleep in seat 24H on my British Airways flight to Gatwick long before the plane took off – a few days in Las Vegas does that to a person.
She moved into a deep sleep in the ER and could not be roused.
Once she was in bed, she plunged into a deep sleep and woke up around 6.30 pm, still feeling drowsy.
When you want to relax, sit in it and sink yourself into a deep sleep!
For a start, they are in such a deep sleep that they will probably not notice you, even if you try to wake them.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com