A simple question indicates significant health problems

As primary contact health practitioners, we were initially on the lookout for red flags (tumour, inflammation, infection, and fracture) during our subjective examination. We also have orange, blue, yellow, and black flags to consider, making a subjective exam feel a bit like a maritime flag-signalling exercise of yesteryear!

Solid evidence points to sleep as a mainstay for all aspects of health, and this recent paper indicates we need to ask a simple question to determine whether our clients are optimising their natural recovery, both physical and mental, through restorative sleep. It is so important that researchers are saying this should be added to our 'red flag' category.

Nonrestorative Sleep as a Preventive Health Indicator1. What is Nonrestorative Sleep?

Nonrestorative sleep (NRS) refers to the subjective experience of not feeling adequately rested after sleep, often captured by a simple question such as:

"Do you get adequate rest during sleep?" (Yes/No)

Although simple, NRS reflects poor sleep quality, even when sleep duration appears adequate (i.e., 7-8 hours).

It may include:

• Non-refreshing sleep
• Non-satisfying sleep
• Non-recovering sleep
• Emotionally charged or restless sleep

It is subjective, but clinically meaningful.

2. Why is NRS important?

A large Japanese cohort study (86,009 participants; mean follow-up 5.7 years) showed:

• 32.9% of the general population reported NRS
• NRS was independently associated with:
  • Ischemic heart disease
  • Heart failure
• The association persisted after adjusting for conventional cardiovascular risk factors
• Risk was particularly significant in individuals under 60 years of age

Importantly:

• NRS added prognostic value beyond sleep apnea syndrome (SAS).
• NRS predicted cardiovascular events, but not cerebrovascular events (e.g., stroke) specifically.

Clinical implication:
NRS may be an early warning sign of cardiovascular vulnerability.

3. Mental health associations

NRS is strongly linked to:

• Depression
• Anxiety
• Increased suicide risk
• Daytime dysfunction
• Emotional dysregulation

Sleep complaints may predict psychiatric disorders independently of existing diagnoses.

Thus, NRS is not only a sleep issue — it is a mental health risk marker.

4. Relationship with sleep apnea

Obstructive sleep apnea (OSA):

• Increases risk of:
  • Hypertension
  • Arrhythmias
  • Stroke
  • Heart failure
• Is associated with psychiatric symptoms and cognitive impairment.

However:

• NRS predicts cardiovascular risk even after accounting for OSA.
• Psychiatric and medical comorbidities reduce CPAP adherence.

Clinical takeaway:
Subjective sleep complaints (NRS) should not be dismissed if OSA testing is negative.

5. Diagnostic challenges

Despite evidence:

• NRS has been progressively removed from formal sleep disorder classifications
• It remains inconsistently defined
• Routine screening is uncommon

Validated tools exist:

• NonRestorative Sleep Scale
• Restorative Sleep Questionnaire

6. Clinical implications for primary contact practitioners

The authors argue that NRS should be:

✔ Systematically screened in routine consultations
✔ Integrated into preventive medicine
✔ Treated as a patient-reported outcome measure
✔ Used to identify at-risk individuals early

Possible actions when NRS is reported:

1. Screen for:
   • Depression/anxiety (e.g., DASS)
   • Insomnia (e.g., ISI)
   • Obstructive sleep apnea (e.g., STOP-Bang)
   • Cardiometabolic risk factors (e.g., waist diameter, BP, physical activity, smoking)
2. Consider interventions:
   • Cognitive Behavioural Therapy for Insomnia
   • Sleep hygiene strategies
   • OSA testing
   • Cardiovascular risk assessment

The Sleep Mastery Course covers these tools and techniques

Japan already includes NRS screening in general health check-ups, demonstrating feasibility at the population level.

Key messages for health professionals

• A single question about sleep restfulness may identify patients at elevated cardiovascular and psychiatric risk
• NRS is common (≈1 in 3 adults)
• It predicts major adverse cardiac events independently of traditional risk factors
• It adds information beyond sleep apnea diagnosis
• It should be considered an early warning symptom rather than a vague complaint
• Integrating sleep assessment into routine preventive care may improve long-term health outcomes

Bottom line

Nonrestorative sleep is:

A simple symptom with major (cardiometabolic & mental health) preventive implications