Dangers of Sleep Apnea and Its Impact on Health
Discover the potential dangers of sleep apnea, including its effects on heart health, concentration, and daytime energy, and why diagnosis matters.
The dangers of sleep apnea are not limited to fatigue and daytime sleepiness. Repeated pauses in breathing cause oxygen to fall, sleep to fragment, and the body's stress response to activate many times through the night. When the condition continues untreated, moderate and severe cases are linked to a higher risk of high blood pressure, heart disease, stroke, and blood sugar disorders.
What Happens in the Body During Sleep Apnea?
When the airway narrows or closes during sleep, less air enters and the oxygen level in the blood may fall.
The brain responds to this change with a very brief arousal the person usually does not remember, until breathing resumes.
This cycle may repeat many times within a single hour:
Breathing stops or decreases.
Oxygen falls.
The body activates to restore breathing.
A brief arousal occurs.
The person returns to sleep and the cycle repeats.
The problem here is not only the number of sleep hours but the quality of sleep and its continuity.
A person may sleep seven or eight hours yet wake momentarily many times without remembering it, so they wake in the morning still tired.
Why Are the Dangers of Sleep Apnea Linked to the Heart?
During apnea episodes, the body is repeatedly exposed to falling oxygen, brief arousals, and activation of the nervous system responsible for the stress response.
Over time, these changes may be linked to raised blood pressure and an increased load on the heart and blood vessels.
Obstructive sleep apnea is therefore linked to a higher likelihood of several problems, including:
High blood pressure.
Heart rhythm disturbance in some patients.
Coronary artery disease.
Heart failure.
Stroke.
This does not mean every patient with sleep apnea will develop these complications, but the risk rises with the severity of the condition and the presence of other factors such as obesity, diabetes, and high blood pressure.
When Do the Dangers of Sleep Apnea Increase?
Doctors use the apnea-hypopnea index (AHI) to determine the number of pauses or reductions in breathing per hour of sleep.
In adults, the condition is usually classified as:-
Mild: 5 to fewer than 15 events per hour.
Moderate: 15 to fewer than 30 events per hour.
Severe: 30 events or more per hour.
But the number alone does not determine the dangers of sleep apnea for every person.
The doctor also looks at:
The degree of oxygen drop.
The duration of the oxygen drop.
The presence of severe daytime sleepiness.
Blood pressure.
Heart disease.
Diabetes.
Age and weight.
Symptoms while driving and at work.
Two people with the same test number may therefore need different treatment plans.
Can Sleep Apnea Cause Death?
Severe untreated cases are linked in studies to a higher risk of cardiovascular disease and death compared with people who do not have sleep apnea.
But the AHI number alone cannot be turned into a direct prediction of mortality risk for a particular person.
The risk is influenced by many factors, including age, heart disease, blood pressure, obesity, diabetes, and the degree of oxygen shortage during sleep.
The purpose of testing is therefore not only to know the number of events, but to assess the full picture.
Another Important Risk | Sleepiness While Driving
Among the most dangerous consequences of untreated sleep apnea is severe daytime sleepiness.
It may appear as:
Difficulty concentrating.
Heavy eyes while driving.
Losing attention for moments.
Not remembering part of the road.
Dozing off unintentionally.
Feeling sleepy while driving should therefore not be treated as mere tiredness.
If you feel you may doze off while driving, stop driving somewhere safe, and do not rely on coffee or opening the window to keep going.
Is Sleep Apnea Linked to Diabetes?
Yes, there is a clear relationship between obstructive sleep apnea and type 2 diabetes.
Studies point to sleep apnea being associated with insulin resistance and disturbed blood sugar control, and obesity is an important shared factor between the two conditions.
But it is not accurate to say that poor blood sugar control alone directly increases the severity of sleep apnea.
It is important to consider sleep disorders in a patient with diabetes if they have:
Loud snoring.
Pauses in breathing noticed by someone else.
Waking with gasping.
Severe daytime sleepiness.
Recurrent morning headaches.
Why Might the Dangers of Sleep Apnea Go Unnoticed?
The problem is that apnea episodes happen during sleep, and in many cases the patient does not remember the brief arousal that follows each episode.
The first signs a person notices may therefore appear during the day, such as:
Persistent fatigue.
Sleepiness.
Morning headache.
Poor concentration.
Falling asleep quickly when sitting quietly.
In many cases the bed partner is the first to notice:
Loud snoring.
Pauses in breathing.
Gasping during sleep.
Anyone sleeping alone may have the breathing disorder continue for longer before it is discovered.
You can learn about the symptoms and causes more broadly in the article on sleep apnea.
Can the Risks of Sleep Apnea Be Reduced?
Yes. Treating sleep apnea helps reduce breathing pauses and improves oxygen levels, sleep quality, and daytime sleepiness.
Treatment may also help improve blood pressure in some patients.
But treatment should not be considered a guarantee that all heart and stroke risks are removed, because these risks are affected by other factors as well.
The plan differs with the severity of the condition and its cause, and may include:
A CPAP device.
Weight loss where needed.
Oral appliances in some cases.
Treating nasal or airway obstruction where appropriate.
Surgical options in specific cases.
You can review the available options in the article on sleep apnea treatment.
When Should You Not Postpone a Sleep Apnea Assessment?
See a specialist if you have:-
Sleepiness or loss of focus while driving.
Persistent loud snoring.
Pauses in breathing noticed by your bed partner.
Repeated waking with gasping or choking.
Severe daytime sleepiness.
Recurrent morning headaches.
Difficulty concentrating at work.
High blood pressure that is difficult to control.
Assessment becomes more important when more than one sign is present at the same time.
You can start with a sleep disorders consultation to determine the right test.
Is a Home Sleep Test Enough to Diagnose the Condition?
A home sleep test can be used to diagnose obstructive sleep apnea in many adults who have clear symptoms and no complex health conditions that would prevent relying on this type of test.
But home testing is not suitable for everyone.
In some cases the doctor may need a more detailed sleep test, particularly if the home result is unclear or there are possibilities of other sleep disorders.
Why Choose Subat Clinics?
At Subat Clinics, the severity of sleep apnea and its effect on each patient are assessed based on symptoms and the test result, not on a single number alone.
Home sleep tests for suitable cases, with no need to stay overnight in hospital.
Advanced sleep testing when needed, for cases requiring more detailed recording during sleep.
A Saudi team specialized in pulmonary medicine and sleep medicine.
Results within three working days, read by the consultant with the right treatment step identified.
For those living outside Riyadh, assessment or follow-up can be arranged through an online sleep disorders consultation.
How to Prepare for Your Appointment
Before the appointment:-
Note the symptoms you experience at night and during the day.
Ask your bed partner about snoring or pauses in breathing.
Record your level of sleepiness at work or while driving.
Bring your blood pressure or blood sugar readings if you monitor them.
Mention any previous diagnosis of heart disease or diabetes.
Bring a list of the medications you use.
Conclusion
The dangers of sleep apnea do not come from the snoring itself, but from repeated airway obstruction, falling oxygen, and fragmented sleep, night after night.
The condition matters more when it is moderate or severe, or when it comes with severe sleepiness or conditions such as high blood pressure, diabetes, and heart disease.
But the degree of risk cannot be determined from symptoms alone, so a sleep test remains the way to show how many apnea events occur and how much effect they have through the night.
Find Out the Severity of Your Sleep Apnea
If you have persistent snoring, pauses in breathing, or severe daytime sleepiness, an assessment helps identify the severity of the condition and the right treatment step.
📍 Othman Bin Affan Road, Al Taawun District, Riyadh 12477
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Sources:-
This content is for health awareness purposes and does not replace a personal medical consultation. Do not start or stop any treatment without consulting your doctor.
Medically reviewed by:
Dr. Ahmed Alruhaimi — Consultant in Pulmonary Medicine and Sleep Medicine, Subat Clinics.
Last reviewed: September 2026.
Frequently Asked Questions
Are the dangers of sleep apnea the same in men and women?
No. The risk is affected by the severity of the apnea, age, weight, and coexisting conditions more than by sex alone. In some women the condition may also appear with less obvious symptoms such as fatigue, insomnia, and headaches rather than loud snoring.
Is the risk lower if my weight is normal?
Excess weight is an important risk factor, but it is not the only cause. Someone of normal weight may have sleep apnea because of the shape of the airway or jaw, or other factors.
Does snoring improving mean the sleep apnea has gone?
Not necessarily. Snoring may decrease while some breathing pauses continue. So if a person has been diagnosed with sleep apnea, the sound of snoring alone should not be relied on to judge whether treatment is working.
How long does improvement take after starting treatment?
Snoring, sleepiness, and sleep quality may improve within a short period with regular use of treatment, while changes in blood pressure and long-term health risks differ from person to person depending on the severity of the condition and coexisting illnesses.