Testosterone and sleep appear to influence each other in men: testosterone levels are tied to sleep, a small controlled study found that a week of short sleep lowered testosterone in healthy young men, and low testosterone and sleep apnea often occur together. Understanding which direction the problem is coming from matters for how it’s treated.
Who This Is For
This is for men noticing symptoms like low energy, reduced motivation, or poor sleep alongside other possible signs of low testosterone, or anyone considering testosterone therapy who wants to understand its relationship with sleep before starting.
Quick Summary
- A week of short sleep (about five hours a night) lowered testosterone by 10% to 15% in a small study of healthy young men
- Low testosterone and sleep apnea often occur together, and the link may run in both directions
- The relationship may run in both directions, which makes it worth addressing sleep directly
- Testosterone therapy may worsen sleep apnea, and Cleveland Clinic lists untreated sleep apnea among the conditions that may prevent starting it, so screening matters before starting
- This is a clinical topic, testosterone levels and treatment should be evaluated and managed by a doctor
Why This Happens
Short sleep can lower testosterone
Testosterone follows a daily rhythm: MedlinePlus notes that levels are typically highest in the morning, which is why blood samples are taken between 7 and 10 am. Sleep loss can lower them. In a 2011 JAMA study (Leproult and Van Cauter), 10 healthy young men whose sleep was cut to about five hours a night for a week had daytime testosterone levels 10% to 15% lower than when they were well rested. It was a small study of young, healthy men, so it does not show how much a few short nights affect other men, or whether better sleep raises testosterone in men whose levels are already low.
Sleep apnea and low testosterone often go together
Sleep apnea and low testosterone show up together often. Cleveland Clinic lists obstructive sleep apnea among the risk factors for low testosterone. A review of sleep apnea and testosterone replacement therapy (La Vignera and colleagues, 2020) describes sleep fragmentation as disrupting the normal rhythm of testosterone production, and notes that obesity can lower testosterone further. Because the two conditions are intertwined, it is hard to say from symptoms alone which is driving which.
Stress and poor sleep compound the problem
Stress and poor sleep often go together, and stress hormones such as cortisol may play a role, although we did not find strong evidence that settles how much. This overlaps with how cortisol affects sleep at night, the same stress-hormone pathway that can disrupt sleep may also affect testosterone.
How to Fix It
1. Prioritize consistent, adequate sleep first
Since testosterone production is so tightly tied to sleep, improving sleep duration and consistency is one of the most direct, non-medical levers available. Whether improving sleep raises testosterone in men whose levels are already low is less well established, but adequate sleep is worth sorting out before assuming hormone therapy is the only option.
2. Get tested rather than guessing
Low energy, poor sleep, and reduced motivation have many possible causes. A blood test (taken in the morning, when levels are typically highest) is how a doctor confirms whether testosterone is actually low. Cleveland Clinic says the diagnosis usually requires two separate morning blood samples.
3. Rule out sleep apnea before starting testosterone therapy
Testosterone therapy can worsen breathing during sleep in some men. A 2020 review advises using testosterone therapy cautiously in obese men with low testosterone and breathing problems during sleep, especially if they are not on CPAP, and Cleveland Clinic lists untreated obstructive sleep apnea among the conditions that may prevent someone from receiving testosterone therapy. A sleep evaluation is therefore a reasonable step before beginning treatment, not just something to think about afterward if symptoms appear.
4. Support the basics that affect both sleep and testosterone
Regular exercise is generally good for both sleep and overall health, see how a lack of exercise affects sleep for more on that connection. Managing stress and limiting alcohol also support both.
5. If on testosterone therapy, monitor sleep specifically
If starting or already on testosterone replacement therapy, mention any new snoring, gasping, or daytime sleepiness to the prescribing doctor promptly, since these can signal sleep apnea developing or worsening and may require adjusting the treatment plan.
Practical Tips
- Aim for 7-9 hours consistently rather than trying to make up for short nights on weekends
- Keep the bedroom cool, dark, and quiet to support good-quality sleep
- Limit alcohol close to bedtime, since it can disrupt sleep (see how alcohol affects sleep quality)
- Track energy and sleep together for a few weeks before assuming hormone therapy is needed
Common Mistakes
- Starting testosterone therapy without a sleep apnea evaluation
- Assuming fatigue is purely hormonal without first addressing basic sleep habits
- Ignoring new snoring or witnessed breathing pauses after starting testosterone treatment
- Self-treating with supplements marketed to “boost testosterone” instead of getting an actual blood test (Cleveland Clinic advises against over-the-counter supplements without professional guidance)
When to See a Doctor
Low energy and poor sleep have many causes, and only a doctor can tell whether testosterone is involved. Cleveland Clinic recommends seeing a healthcare provider if symptoms interfere with your quality of life. MedlinePlus lists symptoms of low testosterone in men such as low sex drive, erectile dysfunction, infertility, loss of muscle mass, and thinning bones or anemia without an obvious cause. Make an appointment if:
- You have symptoms like these together with persistent fatigue or poor sleep
- You snore loudly, gasp or choke at night, stop breathing in your sleep, or are very sleepy in the day, which can point to sleep apnea
- You are considering testosterone therapy, or already take it and notice new snoring, gasping or daytime sleepiness
- You are thinking about “testosterone booster” supplements: check with a doctor first
Frequently Asked Questions
Can low testosterone alone cause insomnia?
It may contribute, but we did not find strong evidence either way, and low testosterone more commonly shows up as fatigue and low motivation rather than trouble falling asleep. If insomnia is the main symptom, it is worth looking at sleep apnea and stress alongside a testosterone blood test, since all three overlap frequently.
Does testosterone therapy help you sleep better?
Not reliably. If low testosterone was contributing to fatigue or poor sleep, correcting it may help some men. But testosterone therapy can also worsen sleep apnea, so any improvement in sleep needs to be weighed against that risk, which is why a sleep evaluation before starting therapy is worth asking about.
How is low testosterone diagnosed?
Through morning blood tests: Cleveland Clinic says the diagnosis usually requires two separate morning samples, when levels are typically highest. A doctor will typically also ask about symptoms and may check other hormone levels before making a diagnosis or recommending treatment.
Key Takeaways
- Sleep and testosterone appear to affect each other
- Short sleep lowered testosterone in a small study of healthy young men; sleep apnea and low testosterone often occur together
- Testosterone therapy may worsen sleep apnea, so ask about a sleep evaluation first
- Improving sleep habits is a reasonable first step before assuming hormone therapy is necessary
About This Article
Written by the Sleep Fixes editorial team. We’re not medical professionals. We research each topic against primary sources and hold ourselves to being critical and thorough about what actually makes it onto the site.
This article is part of Sleep Fixes, a site focused on practical, easy-to-follow solutions for common sleep problems like night waking, dry mouth, overheating, and disrupted sleep.
The content is based on widely accepted clinical and sleep principles. It is educational, not a diagnosis, and it is not a substitute for care from a qualified healthcare provider.
Testosterone levels and treatment decisions should be evaluated and managed by a doctor, including screening for sleep apnea before starting therapy.