"deeper sleep" is a perfectly valid and grammatically correct phrase in written English.
You can use it to describe a state of sleep that is deeper than normal, or a desire to reach a deeper level of sleep. For example, "I am exhausted, and I'm hoping for a deeper sleep tonight."
It removes distractions and lets you have a deeper sleep.
Not only do cytokines help fight infection, but they regulate deeper sleep.
What Mr. Timerman did find was something quieter: a deeper sleep, odder monsters.
So I just did what I always do, which is go into a deeper sleep.
Nor have they heard of anyone using medication to achieve deeper sleep.
From more patience, better relationships, and deeper sleep, to easing depression symptoms and increased happiness, the benefits of making gratitude a daily habit can actually be really powerful.
So you can believe me, in the far deeper sleep (these new apple leaves, maybe) we are all going to be perfectly all right.
CNO also increased NREM EEG delta power at Ta 36 °C (Fig. 6e) when compared to CNO at Ta 29 °C, suggesting deeper sleep at higher Ta.
Research has found that lullabies lower heart rates and induce deeper sleep in infants; infants also have shown the ability to identify fundamental properties of music, such as pitch and rhythm, with the same accuracy as musicians.
The first three stages are called non-rapid eye movement (non-REM) in which you fall into a progressively deeper sleep with increasingly less reaction to environmental stimuli (like your fidgety partner).
"Forty million Americans suffer from prolonged anxiety". The Gravity Blanket promised to increase serotonin and melatonin levels, decrease cortisol (the so-called stress hormone), and put you in a deeper sleep.
