The phrase "shallow sleep" is grammatically correct and can be used in written English.
It refers to a state of sleep where a person is not fully subconscious and may be easily awakened. Example: After staying up late studying, she only managed to drift into a shallow sleep, constantly waking up throughout the night.
It warns the unhappy man of the fragility of his house, hounding him from shallow sleep and violent dreams.
It was suggested that exposure to the 65 dB(A) ship noise exerted adverse effects on nocturnal sleep, subjectively and in part polygraphically (REM sleep and shallow sleep).
Our results show that the genetic fuzzy classifier (GFC) agreed with visual sleep staging approximately 84.6% of the time in detection of wakefulness (WA), shallow sleep (SS), deep sleep (DS), and rapid eye movement (REM) stages.
Across the group of 12 patients, two did not fall asleep during the rest period; ten reached shallow sleep stages (sleep stages N1 and N2); seven reached deep sleep (sleep stage N3, besides N1 and N2); and five had rapid-eye-movement sleep (REM).
Stage one is very early, shallow sleep.
Even if you don't notice the periods of waking, those drinks tend to produce broken, shallow sleep.
In other animals, slow-wave sleep is usually described as deep, dreamless sleep, while rapid eye movements are linked to shallower sleep and dreaming.
The consequences include more fragmented sleep, prolonged wake at night, shallower sleep depth (lower nonrapid eye movement [NREM] δ power), increased NREM-to-REM transitions, hindered recovery sleep after sleep deprivation, and impaired memory.
A meta-analytic review of PSG studies revealed small effect sizes indicating that people with PTSD have more stage 1 sleep (N1) and less slow wave sleep (SWS), collectively indicating shallower sleep, than those without PTSD [ 33].
Preliminary results of those studies include shallower sleep, longer sleep onset latency (SOL), and altered REM sleep mostly during the mid- or late-luteal phase when progesterone is high and estrogen is moderate (mid-luteal) or both hormones are decreasing (late-luteal) compared to the mid-follicular phase [ 69- 71].
Shallow-sleep dreams have been the source of many of my best ideas (sadly, small children are no respecters of prospective genius).
