Sleep Apnea and Short Sleep: Why Sleeping Less Than 6 Hours Could Be Deadly

January 21, 2026 |

Obstructive Sleep Apnea Treatment & Tips

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A new study finds that patients with sleep apnea who have short interruptions in breathing are at a significantly higher risk for death than those with longer interruptions.¹

“This result seems counter-intuitive because you might expect longer periods of not breathing to be more severe,” said Matthew P. Butler, PhD, assistant professor in the Oregon Institute of Occupational Health Studies at Oregon Health & Science University, and author of the study, in a press release.²

Is the AHI a Good Indicator?

Sleep apnea is a serious condition where a person’s airway is collapsed during sleep. As a result, the individual to periodically stop breathing. This condition is linked to a number of comorbidities, including high blood pressure, heart disease, and increased risk of death. Sleep specialists use the apnea-hypopnea index, or the number of times a patient stops breathing per hour of sleep, to determine the severity of sleep apnea.

The new study challenges this method by suggesting that in addition to how many breathing interruptions occur, it is also important to determine how long each one lasts.

The Research

Researchers analyzed the records of 5712 adults with an average age of 63. These patients all participated in the National Heart, Lung, and Blood Institute’s Sleep Heart Healthy Study. There were an equal number of men and women enrolled in the 11-year study.

In summary, the study found:¹

Patients with the shortest apneas were 31% more likely to die during the decade-long follow-up.
Within the group classified as having moderate sleep apnea, patients with the shortest duration of breathing events had a 59% increased risk of dying.

How Does This Impact You?

The most common and effective treatment for sleep apnea is CPAP therapy. However, some patients find the machine and the mask combo uncomfortable and choose not to use it if their sleep apnea is not severe. Mild or moderate sleep apnea patients are at a minimum, equal to or at greater risk of death as severe sufferers. CPAP remains the most effective and least invasive therapy available. Therefore, use it consistently in even the most moderate of cases.

The CPAP Shop has a team of experts ready to answer all your questions regarding CPAP therapy and products. Give us a call at 866-414-9700.

References:
1. Butler MP, Emch JT, Rueschman M, et al. Apnea-hypopnea event duration predicts mortality in men and women in the Sleep Heart Healthy Study. Amer J Resp Crit Care Med. 2018 Oct 19.
2. Length of each breathing disruption in sleep apnea may predict mortality risk better than number of breathing disruptions [press release]. American Thoracic Society. 2018 Oct 16.

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Chris Vasta is the president of The CPAP Shop and an expert in sleep and respiratory therapy. He often provides insights on product design and functionality on various manufacturers’ prototypes and is frequently tapped to provide reviews on new releases.

This post was updated with the latest information in January 2026.

For years, we’ve been told that sleep apnea is dangerous because it stops you from breathing. But what if the amount of time you spend asleep is just as critical as the quality?

A landmark study from Penn State College of Medicine first sounded the alarm, but new 2025–2026 research has confirmed a terrifying reality: People who suffer from both sleep apnea and short sleep duration (less than 6 hours) face a mortality risk significantly higher than those with just one condition alone.

In the medical community, this is now called COMISA (Comorbid Insomnia and Sleep Apnea), and it is considered a major public health crisis. Here is why your "short nights" might be shortening your life.

Why 6 Hours of Sleep Matters

The human body runs a nightly "maintenance cycle" that takes roughly 7–8 hours to complete. This cycle flushes toxins from the brain (via the glymphatic system) and repairs blood vessels.

When you cut that short—sleeping less than 6 hours—while also battling the oxygen drops of sleep apnea, you create a biological "perfect storm."

The 2026 Data: Recent studies published in The American Journal of Managed Care and Sleep Medicine show that adults with moderate-to-severe OSA who sleep less than 6 hours have a threefold increased risk of dying from heart disease compared to those who sleep normal hours.

How Short Sleep Kills

Why is the combination so deadly? It comes down to Metabolic Syndrome. When you are sleep-deprived and air-deprived, your body enters a state of chronic panic:

Cortisol Overload: Short sleep spikes your stress hormones, keeping your blood pressure dangerously high 24/7.
Inflammation: Markers like C-Reactive Protein (CRP) skyrocket, causing plaque to build up rapidly in your arteries.
Insulin Resistance: Your body loses the ability to process sugar, leading to rapid weight gain and Type 2 Diabetes.

Are You a "COMISA" Patient?

If you have sleep apnea, you might think you sleep too much. However, many patients develop secondary insomnia—a subconscious fear of falling asleep because the brain knows it will choke. Signs you have COMISA:

You struggle to fall asleep despite being exhausted.
You wake up frequently and cannot fall back asleep.
You use a CPAP machine but still clock less than 6 hours of use per night.

Is AHI a Good Indicator?

The new study challenges this method by suggesting that in addition to how many breathing interruptions occur, it is also important to determine how long each one lasts.

The Good News: You Can Reserve the Risk

The same studies that highlighted the risk also highlighted the cure. Patients who treated their sleep apnea with CPAP therapy AND extended their sleep duration to >7 hours saw their mortality risk drop back to near-normal levels.

How to Extend Your Sleep:

Treat the Apnea First: Once your brain realizes it can breathe safely (thanks to CPAP), the "insomnia anxiety" often fades, allowing you to sleep longer.
CBT-I: Cognitive Behavioral Therapy for Insomnia is now the gold-standard companion to CPAP for COMISA patients.

Conclusion