Deep Sleep Deficit Zone
What this means
Your nervous system is likely spending too much time in a state of alertness. Even if you are in bed long enough, your brain may not be consistently dropping into deep, restorative sleep. Your brain is having a difficult time creating sleep. This pattern is often driven by chronic stress, carrying emotional stress throughout the day, circadian rhythm disruption, frequent travel, or an imbalanced nervous system.
Score Range: 10-24
What this affects
Emotional regulation and resilience
Focus, memory, and mental clarity
Brain detoxification and repair
Decision-making and judgment
Creative problem-solving
Physical recovery and stress recovery
Cardiovascular health
Long-term brain health, healthspan, and longevity
How the book and Waves 4 Longevity® help
The book builds awareness by explaining why deep sleep matters and how stress, emotions, and lifestyle patterns interfere with it.
Waves 4 Longevity® goes deeper into implementation, guiding you step by step through nervous system retraining, emotional regulation tools, and evidence-based sound stimulation designed to restore slow-wave sleep.
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Take Back Your Sleep Book
In Take Back Your Sleep, Dr. Ana Casas, MD, and Victoria Dhar, MSc, combine clinical medicine and sleep neuroscience to show how deep sleep drives clarity, resilience, and long-term brain health.
Drawing on real-world work with executives and high performers, they reveal how modern life disrupts sleep, and how to restore it.
“A manual written for the ones who do not just want to live, but want to feel alive, think clearly, recover deeply, and accomplish the goals that matter most to them.”
Victoria Dhar MSc.
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