The phrase "a profound sleep" is correct and usable in written English.
It can be used to describe a deep, significant, or restorative sleep, often in literary or poetic contexts.
Example: "After the long journey, he fell into a profound sleep, undisturbed by the world around him."
Alternatives: "deep slumber" or "sound sleep".
They fell into a profound sleep.
The stern voice of his father at last checked the wild torrent of words; they took him to bed, and a profound sleep of twelve hours restored him to his normal state".
In 1811 she travelled from Rome to Naples, splitting the journey in half with a stop after 60 miles (97 km), and later ascended again from Rome to a height of 12,000 feet (3,660 m) where she claimed that she fell into a profound sleep for a while before landing at Tagliacozzo.
I was sleeping 8 to 10 hours a night, but I still had a profound delta sleep deficit.
The "intensity" of sleep is determined by time spent awake, by genetic factors, and by environmental disturbance, with more profound sleep characterized by a greater intensity of these EEG frequencies, indicative of more pervasive neuronal synchrony [ 13].
From the operating table you can only fall a few feet at the most or gently pass from profound sleep into oblivion, never knowing the difference.
One form includes vivid hallucinations on awaking or falling asleep, temporary but profound sleep paralysis on awakening that does not affect breathing, and sudden, brief loss of muscle power in the limbs and trunk during emotional moments such as laughter (cataplexy).
La Morgia and her colleagues, aware of the profound sleep problems often seen in Alzheimer's, wondered whether the cells may stop doing their job as the disease progresses.
Approximately three-quarters of patients have profound sleep disturbance, including nocturnal insomnia and daytime somnolence, giving rise to the disease name, sleeping sickness.
We have rewritten this sentence to read as follows: "However, during the more profound sleep state of nREM III, there is a…" The authors do not discuss the finding of reduced CBF on recovery of responsiveness: this is one of the most interesting and perplexing findings that deserves some discussion.
That's just not even worth thinking about, is it?" Blogs were written: "In some deep, profound, sleep-deprived way, each of us is CBeebies.
