How Low Testosterone And Sleep Apnea Are Connected

Low testosterone and sleep apnea show up together far more often than chance alone would explain, and research more often ties sleep apnea to lower testosterone than the reverse. Obstructive sleep apnea (OSA) breaks up sleep and lowers blood oxygen at night. Both of those changes are associated with lower testosterone over time (Kim & Cho, 2018). Body weight ties the two together too, because extra fat raises the risk of both.

For any man weighing his options, that overlap changes the plan. A men's hormone health evaluation reviews sleep, weight, and lab work side by side, since treating one problem while ignoring the other can backfire.

The link between low testosterone and sleep apnea is well documented. Men with OSA tend to have lower testosterone than men without it, and the more severe the apnea, the larger the drop tends to be. The relationship runs both ways and is shaped by shared factors like obesity. Testosterone therapy can also make untreated apnea worse in some men.

Can low testosterone cause sleep apnea?

Probably not in the way the question assumes. Research leans the other way, with sleep apnea more often linked to lower testosterone than the reverse, though the relationship is complex and shaped by shared factors like obesity.

In severe cases, sleep apnea disturbs sleep dozens or even hundreds of times a night. Each pause starves the body of oxygen. Over months, that pattern lowers testosterone. Two other factors, extra body fat and older age, raise the odds of both conditions at once, which makes them easy to confuse. So a man with both isn't usually seeing apnea caused by his hormones. He's more often seeing apnea drag his hormones down.

Why low testosterone and sleep apnea travel together

Three things connect them: broken sleep, low overnight oxygen, and body fat.

Most of a man's daily testosterone is released during sleep, especially deep and REM sleep. Sleep apnea cuts those stages short, so the body makes less. Broken sleep also raises cortisol, a stress hormone, and higher cortisol is tied to lower testosterone. Extra body fat adds another layer, since fat tissue changes how the body handles hormones and also narrows the airway during sleep. Men who notice symptoms of low testosterone like low energy or low drive, plus loud snoring or daytime tiredness, often have both problems feeding each other.

What the research shows

Studies consistently find that men with obstructive sleep apnea carry lower testosterone than men without it (Kim & Cho, 2018). Across that body of research, more severe apnea tends to line up with a larger drop.

Symptomatic sleep apnea is common in older men, and the risk rises with excess weight. What counts as low is partly about lab numbers and partly about symptoms, which is why low testosterone tests weigh both. The same research carries an honest caveat: treating sleep apnea does not reliably raise testosterone in most studies. Better sleep helps the conditions that support healthy hormones, but it isn't a switch that flips testosterone back up. That gap between what men expect and what the evidence shows is where expectations often run ahead of the science.

Why testosterone therapy won't fix sleep apnea

Testosterone therapy is used to manage confirmed deficiency. It is not a treatment for sleep apnea, and in some men it may worsen untreated apnea.

This is the part that often gets left out. Replacement testosterone can change the airway and how the body responds to low oxygen. That is why clinical reviews advise checking for sleep apnea symptoms before and after starting therapy. The Endocrine Society guideline goes further, generally advising that severe sleep apnea be treated before testosterone is started, a precaution a provider weighs with each patient (Bhasin et al., 2018). Regulators draw a firm line as well. The FDA approves testosterone only for low levels tied to a medical condition, not for low testosterone from aging alone, and a 2025 label update kept that limit while adding a warning about increased blood pressure (FDA, 2025). So testosterone is not a fix for sleep apnea, even when the two conditions overlap.

Does treating sleep apnea raise testosterone?

Sometimes, but not reliably. Treating sleep apnea with CPAP can improve sleep and, in men with severe apnea, may help sexual function. Most studies, though, do not show CPAP alone consistently raising testosterone.

The honest takeaway is that better sleep supports healthy testosterone without promising a higher number on a lab report. For a man whose low testosterone comes mainly from poor sleep, fixing the apnea is still worth it, because untreated apnea carries its own risks to the heart and metabolism.

Using CPAP and testosterone therapy together

The two tools do different jobs, and that difference is the whole point. CPAP, a common sleep apnea treatment, addresses the breathing problem. Testosterone therapy is for confirmed deficiency, not apnea, and only when a provider finds it appropriate.

A man with both conditions usually needs both addressed, but in the right order and with monitoring. Replacement testosterone can raise red blood cell counts and blood pressure. So providers track labs like hematocrit over time, watch heart safety, the focus of the TRAVERSE trial (Lincoff et al., 2023), and check for any change in sleep. Replacement testosterone can also lower sperm production, so men who want children should ask about protecting fertility before starting.

Sleep habits that support healthy testosterone

Better sleep supports healthy testosterone, so the basics carry real weight. None of these replace treatment for confirmed sleep apnea or low testosterone, but they help.

1. A steady sleep schedule, including weekends, keeps the body's testosterone rhythm on track.

2. Getting enough sleep most nights supports the body's testosterone, most of which is released during sleep.

3. A cool, dark, quiet bedroom supports deeper, more restful sleep.

4. Less alcohol, caffeine, and nicotine in the evening protects sleep quality, since alcohol in particular breaks up sleep later in the night.

5. Putting screens away about an hour before bed makes falling asleep easier.

6. Reaching and holding a healthy weight eases both low testosterone and sleep apnea, because extra body fat worsens each one.

How are low testosterone and sleep apnea tested for?

Confirming each condition comes first, and that means real testing, not guesswork. Low testosterone is confirmed with symptoms plus blood work (Mayo Clinic, 2024), and sleep apnea is confirmed with a sleep study.

For low testosterone, clinical guidelines lay out a clear process:

1. A provider reviews symptoms such as low energy, low libido, or mood changes.

2. Blood is drawn in the morning, when testosterone tends to be highest.

3. A second morning draw confirms the result, because one low reading is not enough.

4. A consistently low morning testosterone level, paired with symptoms, may point toward deficiency, which a clinician interprets individually.

5. Additional hormone tests help find the cause and rule out other issues.

A man can compare a single test against a full hormone panel to see what each one measures. Marek Health connects men to licensed providers who review hormones and sleep together, order lab work, and prescribe only when it is medically appropriate, where state law allows. Whether testing or therapy is right is an individualized decision a man makes with a provider. Low testosterone and sleep apnea often overlap, so confirming both before treating either supports safer, more individualized care.

Disclaimer: This blog post is intended for informational purposes only and should not be considered medical advice. Always consult a healthcare professional before making changes to your health routine.

FAQs

Are low testosterone and sleep apnea connected? 

Yes. Studies consistently link the two, and the connection more often runs from sleep apnea to lower testosterone than the reverse, through broken sleep and low overnight oxygen. Obesity raises the risk of both, and the two likely influence each other. Symptomatic sleep apnea is common in older men, and many also carry low testosterone.

Can a man start testosterone therapy if he has sleep apnea? 

Only after a provider evaluates the apnea. Major guidelines advise against starting testosterone in men with untreated severe obstructive sleep apnea, because therapy can make apnea worse in some patients. Treating the apnea first, then reassessing hormones, is the safer order.

Does CPAP raise testosterone? 

Not reliably. CPAP treats sleep apnea and improves sleep quality, but most studies do not show it consistently raising testosterone on its own. Better sleep supports healthy hormone levels, but it does not reliably lift a low testosterone reading.

What testosterone level is considered low? 

Low testosterone is not defined by a single number. A consistently low morning level, confirmed on more than one morning and considered alongside symptoms, may point toward deficiency, which a clinician interprets individually. One reading on its own is not enough, since levels vary through the day and from day to day.

How are low testosterone and sleep apnea linked to body weight? 

Excess body fat raises the risk of both low testosterone and sleep apnea. Fat tissue changes how the body handles hormones and can narrow the airway during sleep, so weight links the two conditions and often makes each one harder to treat alone.

Is testosterone approved for low testosterone caused by aging? 

No. The FDA approves testosterone only for low levels tied to a specific medical condition, not for low testosterone from aging alone. A 2025 label update kept that limitation and added a warning about increased blood pressure.

References

• J Clin Endocrinol Metab. 2018;103(5):1715–1744

• N Engl J Med. 2023;389(2):107–117

• World J Mens Health. 2018;37(1):12–18

• FDA. Class-wide labeling changes for testosterone products. 2025

• Mayo Clinic. Male hypogonadism: symptoms and causes. 2024