Veterans with PTSD: How Treating Sleep Apnea Can Ease Nightmares

Treating sleep apnea may help ease nightmares and other PTSD symptoms. In studies of veterans with both conditions, those who used CPAP had fewer nightmares and lower PTSD symptom scores. The more consistently they used it, the more they improved¹²³. These studies did not include randomized comparison groups, so more research is needed.

How are PTSD and sleep apnea connected?

Posttraumatic stress disorder (PTSD) can develop after a frightening or life-threatening event. Common symptoms include nightmares and broken sleep¹. Obstructive sleep apnea (OSA) is a condition in which the throat closes off again and again during sleep. This interrupts breathing and sleep.

The two often occur together. A review of 12 studies estimated that about three in four people with PTSD had at least mild sleep apnea. More than four in ten had a level of sleep apnea that many doctors consider meaningful⁴. Sleep apnea was more common in veterans with PTSD than in other groups⁴. Researchers have also noted that untreated sleep apnea may worsen the sleep-related symptoms of PTSD¹.

Can CPAP reduce nightmares?

CPAP (continuous positive airway pressure) is a bedside machine that sends gentle air through a mask. It keeps the airway open during sleep. Several studies in VA sleep clinics have looked at what happens to PTSD symptoms after veterans start CPAP.

• Nightmares cut in half — In a review of 69 veterans with PTSD and sleep apnea, average nightmares fell from about 10 per week to about 5 per week after CPAP. Daytime sleepiness also improved¹.
• Regular use mattered most — In that study, how regularly people used CPAP was the strongest predictor of fewer nightmares. Each 10% increase in CPAP use nearly doubled the odds of benefit¹.
• Six-month study — In a study that followed 177 veterans for six months, nightmares in the PTSD group dropped by about two-thirds³.

Does CPAP improve other PTSD symptoms?

PTSD symptoms are often tracked with a checklist score, where lower numbers mean fewer symptoms. A prospective study (one that follows people forward in time) looked at combat veterans with PTSD and sleep apnea. Their PTSD checklist scores improved more with longer nightly CPAP use over three months². Veterans with more severe PTSD had larger improvements². Veterans who used CPAP regularly also had less nightmare distress and fewer nightmares².

In the six-month study, PTSD checklist scores went down in veterans with PTSD who used CPAP³. Even veterans who used CPAP only part of the time showed some improvement. CPAP use was the only factor that predicted these changes³.

Among veterans without PTSD, those who used CPAP the least had PTSD checklist scores that went up over time³. The authors suggested that undertreated sleep apnea might contribute to worsening stress symptoms, though this needs more study³.

How strong is the evidence?

These findings are consistent, but they come from observational studies. Researchers tracked veterans before and after treatment. They did not randomly assign some to CPAP and others to no treatment¹²³. People who stick with CPAP may differ in other ways from those who do not.

So it is fair to say CPAP may help PTSD symptoms, not that it will. CPAP is a treatment for sleep apnea. It is not a replacement for PTSD care from a mental health professional.

Why can CPAP be harder with PTSD, and what helps?

A review found that people with PTSD and sleep apnea used CPAP less often and for fewer hours per night than people with sleep apnea alone⁴. Because benefits grew with use¹²³, getting support early may be worthwhile. Helpful steps can include:

• Different masks — Trying different mask styles
• Practice — Practicing with the mask while awake
• Settings — Adjusting pressure settings
• Check-ins — Having regular check-ins with a sleep team

Researchers have also suggested studying CPAP combined with behavioral treatments².

When should you get checked?

Consider a sleep evaluation if you have PTSD and:

• Snoring or gasping — Snore loudly, or someone has seen you stop breathing or gasp in your sleep
• Broken sleep — Have frequent nightmares or wake up many times a night
• Daytime tiredness — Feel sleepy or worn out during the day
• Trouble with CPAP — Have been diagnosed with sleep apnea but find CPAP hard to use

Let your mental health provider know about sleep problems too, so your care can be coordinated.

How Universal Sleep Solutions can help

At Universal Sleep Solutions, we offer in-lab and home sleep testing, CPAP and BiPAP setup with follow-up visits, and CBT-I for people who also struggle with insomnia. For people who cannot use CPAP, we offer Inspire evaluation and oral appliance referral.

Contact Universal Sleep Solutions to schedule an evaluation.