Best Sleep Position for Sleep Apnea: 5 Positions Ranked

The short version

Sleep on your side. In the classic study, breathing pauses were twice as frequent on the back as on the side^[2].
Your back is the worst position, and it is worst for a specific group: people with positional sleep apnea, which is roughly 56% to 75% of patients with obstructive sleep apnea^[4].
Either side beats your back. The difference between left and right is small; pick the left if you have reflux, otherwise the side you can hold.
Cannot stay off your back? Raise the head of the bed a little, or use a wedge, a body pillow, or the tennis-ball trick (it goes on your back, not between your legs).

Sleep on your side, and check your own sleep study, because it probably already proves it. For a large share of people with obstructive sleep apnea, the airway collapses far more often lying flat on the back than lying on the side. That is not folk wisdom; supine sleep is consistently tied to more severe apnea across studies^[13], and it means the position you fall asleep in is a lever you actually control.

Updated September 2026 by the Sleeplay team. This guide compares sleeping positions and is educational, not medical advice. If you are not sure you have sleep apnea, start with the signs and symptoms of sleep apnea.

Side sleeping is the single biggest lever you control

Side sleeping is the best position for obstructive sleep apnea. When you lie on your back, gravity pulls the tongue and soft palate toward the back of your throat; the American Academy of Sleep Medicine puts it plainly: "If you sleep on your back, gravity can cause the tongue to fall back. This narrows the airway, which reduces the amount of air that can reach your lungs."^[1] Turn onto your side and that collapse eases. In Rosalind Cartwright's landmark 1984 study, the apnea index on the back was double the index on the side, and five patients who met the criteria for sleep apnea across the whole night fell within normal limits while on their side^[2]. Modern trials agree: a Cochrane review found positional therapy lowered the apnea-hypopnea index (AHI, the number of breathing pauses and shallow breaths per hour) by about 7 events per hour compared with doing nothing, although the reviewers rated that evidence low certainty^[15].

Here is every position ranked on what actually decides it: what it does to your airway, who it suits, and how it plays with a CPAP mask.

Rank and position	Effect on the airway	Best for	Watch out for	With a CPAP mask (our fitting experience)	What holds you there
1. Side (left or right)	Best. Gravity stops pulling the tongue backward; about half the breathing events of back sleeping^[2]	Almost everyone, and above all positional sleep apnea	Shoulder pressure; rolling onto your back by morning	Works well; a low-profile mask and a CPAP pillow keep the seal	A body pillow in front, a firm pillow or wedge behind, a CPAP pillow
2. Back, upper body raised	Better than flat. A 7.5 degree incline cut median AHI by 31.8% in one study^[9]	People who cannot stay on their side; reflux; bulky full face masks	Stacked pillows bend the neck instead of raising the chest	Easiest position for a mask seal	Bed risers under the head-end legs, an adjustable base, or a torso-length wedge
3. Upright in a recliner	Better than flat: obstructive apneas fell from about 49 to 20 per hour sitting at a 60 degree angle in a small study^[10]	A short-term fallback: a cold, recovery, a night without your gear	Few people sleep well upright for long	Works, with the hose routed over the chair back	The recliner itself
4. Stomach	Mixed. Small studies show improvement; a systematic review calls the evidence inconsistent^[12]^[13]	People who already sleep this way comfortably	Neck and lower-back strain from turning the head	Hardest position for a mask; only minimal-contact styles are realistic	A thin pillow, or none
5. Back, flat (supine)	Worst. Events are more frequent and also longer, with deeper oxygen drops^[2]^[3]	Nobody with untreated obstructive sleep apnea	Snoring, more events, higher CPAP pressure needs^[14]	Good seal, but the machine has to work harder	Nothing: this is the position to train yourself out of

Why your back is the worst position

A man sleeping flat on his back, the worst sleep position for sleep apnea

Back sleeping is worst for two reasons: events happen more often, and each event tends to be more severe. In patients with severe apnea, the pauses that happened on the back were longer, dropped blood oxygen further, and ended in louder snoring and longer arousals than the pauses on the side^[3]. Back sleeping also makes your machine work harder. In a titration study of 60 patients, the optimal CPAP pressure averaged 10.0 cmH2O on the back versus 7.6 on the side^[14]. If high pressure is what makes your therapy uncomfortable, that gap matters; see how to tell if your CPAP pressure is too high, and note that an auto-adjusting machine can lower pressure on its own when your airway needs less support, as it often does on your side.

What is positional sleep apnea, and do you have it?

Positional sleep apnea means your AHI on your back is at least double your AHI in other positions^[5]. It is common: depending on the study, roughly 56% to 75% of patients with obstructive sleep apnea are position-dependent^[4], and in one general-population cohort, 75% of those with OSA were positional^[5]. It is less common in the most severe cases, about 35%^[6]. To check, pull your sleep study report and find two numbers, usually labeled supine AHI and non-supine (or lateral) AHI. If the supine number is at least twice the other, position is a real lever for you. If they are close, changing position will do little, and the last section of this guide is the one to read.

Left side or right side: the honest answer

Either side beats your back by a wide margin, and the gap between sides is small and inconsistent. In one retrospective review of 131 patients, AHI was lower on the right than the left (23.6 versus 30.2 events per hour), against 60.4 on the back, and the edge was significant in moderate and severe apnea but not mild^[7]. A larger 2026 retrospective study of 338 patients found no significant difference between the two sides at all, while the back scored worst of every position^[21]. So do not agonize over the choice:

Pick the left side if you have acid reflux or heartburn. In a randomized trial in healthy volunteers, lying left-side down reduced acid exposure in the esophagus^[8].
If you are pregnant, ask your obstetric provider which side they recommend; for the CPAP side of that picture, see CPAP during pregnancy.
Otherwise, pick the side you can actually hold. A comfortable right beats a left you abandon at 2 a.m., and alternating spares your shoulders.

Raising the head of your bed

If you cannot stay off your back, raise the head of the bed. The most practical study used a gentle slope: a 7.5 degree head-of-bed elevation, made by placing a 15 cm (5.9 inch) block under the legs at the head of the bed so the whole bed tilted, lowered median AHI from 15.7 to 10.7 events per hour, a 31.8% reduction, and raised the lowest oxygen saturation from 83.5% to 87%^[9]. Three honest caveats: it was a single night in mostly mild to moderate patients, the positional-apnea patients in that study did not improve significantly from elevation alone^[9], and in a pilot, a taller 20 cm elevation was dropped because patients had a sensation of falling^[9]. Raise the whole torso, not just the head. Stacking regular pillows bends your neck forward instead of raising your chest. Bed risers under the head-end legs reproduce what the study tested; an adjustable base or a torso-length wedge is the closest alternative.

Does sleeping upright in a recliner help?

Sleeping upright in a recliner can help sleep apnea, but only as a short-term fallback, not a nightly plan. Thirteen men with obstructive apnea were studied overnight lying flat and sitting at a 60 degree angle; sitting up cut their obstructive apneas from about 49 to 20 per hour, and apnea was essentially abolished in roughly half of them^[10]. Useful to know for a bad night, but it is one small, older study, and few people sleep well sitting up for long. Treat the recliner as a bridge, not a plan.

Get your head and pillow right

A man sleeping on his side, the best sleep position for sleep apnea

Head position affects your AHI on its own, separate from body position. In a study that tracked both, people lying on their back who simply turned their head to the side dropped their AHI from 36.0 to 25.8, and turning head and body together brought it from 31.6 all the way down to 4.1; the head-only effect held mainly in people who were not obese^[11]. In practice, on your side you want a pillow tall enough to fill the gap between your ear and the mattress so your head stays level with your spine, not tilted down. A CPAP pillow does this with cutouts that let the mask hang free instead of pushing into the pillow and breaking the seal.

Contour CPAP Cool Flex pillow, top view showing cooling gel panels and side cutouts

Two we reach for often: the CPAP Cool Flex Pillow by Contour, whose flexible neck zone bends to hold the mask, and the CoolPAP Contour Pillow, which suits both back and side sleepers. See all CPAP pillows, and for a full breakdown by sleeper type, the best pillows for CPAP users.

How to side sleep with a CPAP mask on

Man sleeping on his side with a CPAP mask, resting on a CPAP pillow

CPAP treats apnea in every position, but side sleeping lets it work at lower pressure^[14], which usually means more comfort. The catch is mechanical: a regular pillow shoves the mask sideways and breaks the seal. From our own fitting experience, the fix is a lower-profile mask plus a pillow that gives the mask room. As Daniel Feldman, a CPAP specialist at Sleeplay and a side sleeper himself, says in our mask video below, "I'm a side sleeper, too, and I've helped hundreds of customers find the right mask."

Side sleepers usually do best with a nasal pillow mask or a low-profile nasal mask, which sit small on the face and are less likely to unseat against a pillow. Compare options in CPAP masks for side sleepers, or the lightest builds in minimal-contact masks. Our tested picks are in the best CPAP masks for side sleepers, and the mask-by-position rundown is CPAP mask types for different sleep positions. If you wear a full face mask and cannot hold a seal on your side, sleeping on your back with the head raised is a fair compromise rather than a failure.

The hose is the other place a side sleeper loses the fight. A hose that drapes straight off the mask gets pinned under your shoulder the moment you turn, which tugs the mask and starts a leak. In his side-sleeper picks, Daniel points to the ResMed AirFit P30i because "the top of the head hose connection keeps the tubing out of your way," and to the ResMed AirFit N20 for its "low profile and swivel connection that reduces hose drag." With any other mask, route the tubing up over the headboard or clip it to a CPAP hose lift so it floats above you when you roll; more options in our CPAP hose holder guide.

Can you sleep on your stomach with sleep apnea?

You can, and it may even help, but it is the least proven option. In one two-night study the median AHI fell from 23 to 7 on the stomach, though participants used a purpose-built mattress and pillow^[12]. A 2026 study of 338 patients also found a higher AHI on the back than on the stomach, although only 14 of them slept on their stomach long enough to measure, so the authors call that result exploratory^[21]; a systematic review still rates the overall evidence as inconsistent^[13]. The clear downside is mechanical: you have to crank your head fully to one side to breathe, which loads the neck and lower back. If you already sleep this way comfortably, there is no reason to stop. It is not worth forcing yourself into.

How to stop rolling onto your back

Staying off your back all night is the hard part: most people fall asleep on their side and wake up flat. From cheapest to most effective:

The tennis-ball trick. Attach a tennis ball to the back of your pajama top so lying on your back is uncomfortable. It goes on your back, not between your legs, and Mayo Clinic describes exactly this^[20]. It works while you use it, but few people keep it up: at a follow-up about 2.5 years later, only 6% were still using it, most having quit because it was uncomfortable^[16].
A backpack, a firm pillow, or a padded positional belt behind your back. Same idea as the tennis ball, with more padding to block the roll. The AASM lists a pillow, backpack, or tennis ball as acceptable positioning devices^[18].
A body pillow in front of you, such as the Swan Body Support Pillow, keeps your top shoulder and hip from rotating backward, and a pillow between the knees takes strain off the lower back.
A vibrating position trainer (a positional therapy device). Worn on the chest or neck, it buzzes gently when you roll onto your back. In a one-month head-to-head trial in mild positional apnea it matched the tennis ball on breathing results, but far more people kept wearing it, 75.9% versus 42.3%^[17]. Some models are prescription devices, so ask your sleep doctor.

If your partner mostly complains about snoring, the same tricks help; for devices aimed at snoring specifically, see the best anti-snoring devices and the anti-snoring devices collection.

When position alone is not enough

Position is a lever, not a cure, and for some people it is the wrong lever. The AASM's clinical guideline calls positional therapy an effective secondary therapy, or a supplement to primary treatment, for people whose AHI is low off their back, and says the effect should be confirmed on a sleep study before you rely on it^[18]. Four situations where position will not carry you:

Your side AHI is still high. People with non-positional apnea have events in every position; they tend to be the more severe cases^[6], and CPAP is the treatment of choice. Even in positional apnea, CPAP lowers the AHI by about 6 more events per hour than positional therapy^[15], so a sensible setup is both: CPAP, worn on your side, where it tends to need less pressure^[14].
Your events cluster in REM sleep. Some people's apnea happens mostly or only during REM (dreaming) sleep, and those events tend to be longer, with deeper oxygen drops, than events in other stages^[22]. Because most REM sleep comes in the second half of the night, wearing CPAP for only the first half can leave most of it untreated^[22]^[23]. If your report shows a REM AHI far above your non-REM AHI, keep the mask on until morning and ask your sleep doctor about it.
You have central sleep apnea. A small study in heart-failure patients found fewer central events on the side^[19], but position is not an established treatment; see central sleep apnea causes and treatment.
You still wake up exhausted. If you have changed position and the daytime sleepiness or morning headaches continue, talk to your sleep doctor. Weight is another shared lever worth a look: sleep apnea and weight loss.

The bottom line

Sleep on your side, whichever side you can hold through the night. If you end up on your back anyway, raise the whole upper body a little and put something behind you to block the roll. Check your sleep study for the supine and non-supine AHI so you know how much position can do for you. And if you use CPAP, pair it with side sleeping, a mask that tolerates a pillow, and a CPAP pillow, so the two work together instead of fighting each other.

Frequently Asked Questions

What is the best position to sleep with sleep apnea?

Your side. In the classic study, breathing pauses were about twice as frequent on the back as on the side, because lying flat lets the tongue and soft palate fall into the airway. Either side works; raising the head of the bed is the next best option if you cannot stay on your side.

Which sleeping position is worst for sleep apnea?

Flat on your back. Events tend to be both more frequent and more severe there: in studies, pauses on the back lasted longer and dropped blood oxygen further, and most patients needed higher CPAP pressure on their back than on their side.

Should I sleep on my left or right side for sleep apnea?

Either side is far better than your back, and the difference between them is small: one retrospective study found a lower AHI on the right, while a larger one found no difference. Choose the left if you have acid reflux; if you are pregnant, ask your provider which side they recommend. Otherwise pick the side you can hold comfortably.

Is it better to sleep flat or inclined with sleep apnea?

Inclined, if you sleep on your back. Tilting the whole bed 7.5 degrees, with a 5.9 inch block under the head-end legs, lowered median AHI by about 32% in one study. Raise the whole torso (bed risers, an adjustable base, or a torso-length wedge), not a stack of pillows, which bends the neck.

What is positional sleep apnea?

It is obstructive sleep apnea where your AHI on your back is at least double your AHI in other positions. Roughly 56% to 75% of patients with obstructive sleep apnea are position-dependent. Check your sleep study for the supine and non-supine AHI to find out if you do.

What is the pillow trick or tennis ball technique for sleep apnea?

Both keep you off your back. The tennis ball goes on the back of your pajama top, not between your legs; the pillow version is a firm pillow wedged behind your back. Few people stick with the ball long term, and a vibrating position trainer was better tolerated in a head-to-head trial.

What is the best sleeping position for sleep apnea without CPAP?

Side sleeping, with the head of the bed raised a little if you tend to roll onto your back. CPAP remains the first-line treatment, and position works best as a supplement, especially in positional sleep apnea. Check your sleep study for the supine versus non-supine AHI to see how much of your apnea is position-driven before relying on position alone.

Does sleep position matter if you use CPAP?

Yes. CPAP works in every position, but most people need less pressure on their side than on their back, which many find more comfortable. An auto-adjusting machine can lower pressure on its own when your airway needs less support. Side sleeping plus CPAP is a sensible combination.

References

American Academy of Sleep Medicine, Sleep Education. Obstructive Sleep Apnea. https://sleepeducation.org/sleep-disorders/obstructive-sleep-apnea/
Cartwright RD. Effect of sleep position on sleep apnea severity. Sleep. 1984. https://pubmed.ncbi.nlm.nih.gov/6740055/
Oksenberg A, et al. Association of body position with severity of apneic events in severe nonpositional OSA. Chest. 2000. https://pubmed.ncbi.nlm.nih.gov/11035672/
Ravesloot MJL, et al. Efficacy of the new generation of devices for positional therapy: a systematic review and meta-analysis. J Clin Sleep Med. 2017. https://pubmed.ncbi.nlm.nih.gov/28212691/
Heinzer R, et al. Prevalence and characteristics of positional sleep apnea in the HypnoLaus cohort. Sleep Med. 2018. https://pubmed.ncbi.nlm.nih.gov/29957486/
Oksenberg A, et al. Prevalence and characteristics of positional obstructive sleep apnea (POSA) in patients with severe OSA. Sleep Breath. 2020. https://pubmed.ncbi.nlm.nih.gov/31325020/
Ozeke O, et al. Influence of the right- versus left-sided sleeping position on the AHI in patients with sleep apnea. Sleep Breath. 2012. https://pubmed.ncbi.nlm.nih.gov/21678115/
Person E, et al. A novel sleep positioning device reduces gastroesophageal reflux: a randomized controlled trial. J Clin Gastroenterol. 2015. https://pubmed.ncbi.nlm.nih.gov/26053170/
Souza FJFB, et al. The influence of head-of-bed elevation in patients with obstructive sleep apnea. Sleep Breath. 2017. https://pmc.ncbi.nlm.nih.gov/articles/PMC5700252/
McEvoy RD, et al. The effects of posture on obstructive sleep apnea. Am Rev Respir Dis. 1986. https://pubmed.ncbi.nlm.nih.gov/3963630/
Zhu K, et al. Influence of head position on obstructive sleep apnea severity. Sleep Breath. 2017. https://pubmed.ncbi.nlm.nih.gov/28608295/
Bidarian-Moniri A, et al. The effect of the prone sleeping position on obstructive sleep apnoea. Acta Otolaryngol. 2015. https://pubmed.ncbi.nlm.nih.gov/25384381/
Menon A, Kumar M. Influence of body position on severity of OSA: a systematic review. ISRN Otolaryngol. 2013. https://pubmed.ncbi.nlm.nih.gov/24223313/
Oksenberg A, et al. The sleep supine position has a major effect on optimal nasal CPAP. Chest. 1999. https://pubmed.ncbi.nlm.nih.gov/10531165/
Srijithesh PR, et al. Positional therapy for obstructive sleep apnoea. Cochrane Database Syst Rev. 2019. https://pubmed.ncbi.nlm.nih.gov/31041813/
Bignold JJ, et al. Poor long-term patient compliance with the tennis ball technique for positional OSA. J Clin Sleep Med. 2009. https://pubmed.ncbi.nlm.nih.gov/19961026/
Eijsvogel MM, et al. Sleep position trainer versus tennis ball technique in positional OSA. J Clin Sleep Med. 2015. https://pubmed.ncbi.nlm.nih.gov/25515276/
Epstein LJ, et al. Clinical guideline for the evaluation, management and long-term care of OSA in adults. J Clin Sleep Med. 2009. https://pmc.ncbi.nlm.nih.gov/articles/PMC2699173/
Szollosi I, et al. Lateral sleeping position reduces severity of central sleep apnea / Cheyne-Stokes respiration. Sleep. 2006. https://pubmed.ncbi.nlm.nih.gov/16944673/
Mayo Clinic. Sleep apnea: Diagnosis and treatment. https://www.mayoclinic.org/diseases-conditions/sleep-apnea/diagnosis-treatment/drc-20377636
Jereisat RA, et al. The Effect of Different Sleep Positions on the Severity of Obstructive Sleep Apnea: A Retrospective Study. Nat Sci Sleep. 2026. https://pubmed.ncbi.nlm.nih.gov/42730061/
Rishi AR, Rishi MA. Rapid eye movement related obstructive sleep apnea: Where do we stand? Respir Investig. 2021. https://pubmed.ncbi.nlm.nih.gov/34246581/
Mokhlesi B, et al. Obstructive sleep apnea during REM sleep and hypertension: results of the Wisconsin Sleep Cohort. Am J Respir Crit Care Med. 2014. https://pubmed.ncbi.nlm.nih.gov/25295854/

Get useful articles straight to your inbox

Nicole Brener

CPAP Expert

Nicole is a CPAP expert with over eight years of experience in the sleep health space. She studied Nutrition Science & Policy at Tufts University and combines academic training with hands-on experience to help people better understand sleep apnea and CPAP therapy. Her passion for sleep health comes from years of working closely with CPAP users and helping them navigate their journey with confidence.

Read Full Bio

Lilly Perez, RRT

Certified Respiratory Therapist

Certified Respiratory Therapist with 18+ years of experience in respiratory care, specializing in sleep apnea education and patient-centered therapy. Extensive background working with Durable Medical Equipment (DME) providers and clinical teams to support patients with the setup and use of CPAP, BiPAP, and other positive airway pressure (PAP) devices.For over a decade, I’ve conducted high-volume in-home and virtual consultations, educating patients on the causes and impact of sleep apnea, available treatment options, and the clinical benefits of consistent therapy use. My focus is on improving patient understanding, driving adherence, and helping individuals achieve better long-term sleep and respiratory health.

Read Full Bio