How Sleep Affects Testosterone in Men

Most of your testosterone is made while you sleep. When sleep is cut short or broken up night after night, levels can fall, and that shows up as lower libido, flatter energy and a lower mood. Getting 7 to 9 hours of steady, good-quality sleep is one of the simplest ways to support healthy hormone levels.

This guide explains how sleep and testosterone are linked, what the research actually shows, the habits that help, and when it is worth speaking to a doctor.

How sleep controls testosterone

Testosterone runs on a daily clock. Levels climb overnight, reach their high point in the morning around 8am, then drift down through the day to a low in the late afternoon or evening. Sleep is what drives that overnight rise.

The rise depends on sleep itself, not just the hour on the clock. Research on sleep and hormones found the increase needs at least three hours of sleep with normal structure, and the largest jump lines up with the first stretch of deep and REM sleep (Wittert, 2014). When that structure is broken up by frequent waking, the rise is blunted.

What the research says about short sleep

The clearest evidence comes from sleep restriction studies. In one week of sleeping about five hours a night, healthy young men saw testosterone drop by 10 to 15 per cent (Sleep Foundation, 2023). The reduction was larger when sleep was cut from the first half of the night, the part that holds the most deep sleep.

The takeaway is not a single magic number of hours. It is that repeated short or fragmented nights give your body less of the deep sleep it uses to make testosterone.

The link runs both ways

Poor sleep can lower testosterone, and low testosterone can, in turn, make sleep worse. Trouble falling or staying asleep is a recognised symptom of low testosterone, alongside reduced libido, fatigue, low mood and difficulty concentrating (Healthdirect). That can become a loop, where one problem feeds the other, which is part of why sleep is worth taking seriously.

How poor sleep affects libido and performance

Testosterone is only part of the picture. Short sleep also leaves you tired, raises cortisol, and dampens the arousal and blood flow that erections rely on. Chronically high cortisol works against testosterone, so stress and lost sleep tend to compound each other (Wittert, 2014).

Improving your sleep can support your natural sexual function, though responses vary from person to person and sleep is one factor among several.

Sleep apnoea and testosterone

Obstructive sleep apnoea, where the airway repeatedly closes during sleep, is common in men and is often found alongside low testosterone. The relationship is not straightforward. Much of the association is explained by age and body weight rather than the apnoea on its own, and studies of CPAP therapy have not reliably raised testosterone. Weight loss, by contrast, does tend to lift levels (Wittert, 2014).

If you snore heavily, wake gasping, or feel exhausted despite a full night in bed, speak to your doctor about a sleep assessment.

How much sleep do men actually need

Most adults need between 7 and 9 hours a night to feel properly rested and function well the next day (Sleep Health Foundation). Individual needs vary, and a genuine short sleeper is rare. If you regularly run on less than seven hours, that is the first thing worth changing.

Sleep habits that support healthy hormones

You do not need to overhaul your life. A few consistent habits do most of the work.

• Keep a steady bedtime and wake time, weekends included, so your body clock settles.
• Wind down screens in the hour before bed, since light late at night delays your natural sleep signal.
• Go easy on heavy meals and alcohol close to bedtime, as both fragment sleep later in the night.
• Exercise regularly, but leave a gap before bed if hard evening workouts leave you wired.
• Keep the bedroom cool, dark and quiet, ideally around 18 to 20 degrees.
• Give yourself a way to offload a busy mind before sleep, whether that is a short list of tomorrow's tasks or a few minutes of slow breathing.

Stress, cortisol and sleep

Ongoing stress keeps the nervous system switched on, which makes it harder to fall and stay asleep, and keeps cortisol elevated. Because cortisol works against testosterone, managing stress at night is part of protecting your sleep and your hormones. Slow breathing, calm surroundings and stepping away from your phone before bed all help settle the system.

When to see a doctor

If low libido, fatigue, poor concentration or mood changes stick around even after your sleep improves, it is worth having your testosterone checked. A doctor confirms low testosterone with a morning blood test, usually repeated to be sure, and looks for underlying causes before discussing options (Healthdirect).

An online quiz can help you screen your symptoms, but it does not diagnose anything. A diagnosis and any treatment plan come from a registered doctor after an individual consultation, and treatment is only appropriate for some people. If sleep and hormones are affecting how you feel, you can start with a hormone health assessment or read more about how hormone imbalance affects your health and vitality. Keeping your regular GP in the loop is a good idea either way.

For related reading, see the 12 key symptoms of low testosterone in men over 40 and five lifestyle changes that can naturally boost testosterone levels. You can also explore Menova's hormone restoration service.

Frequently asked questions

Can better sleep improve sexual performance?

Better sleep supports the testosterone, energy and blood flow that sexual function relies on, so many men feel a difference when they sleep well. Sleep is one factor among several, though, and responses vary between individuals.

How many hours of sleep do I need for healthy testosterone?

Aim for 7 to 9 hours a night. Sleep restriction studies show that repeatedly sleeping around five hours can lower testosterone by 10 to 15 per cent, so consistently short nights are the pattern to avoid.

Does napping make up for lost sleep?

A nap can ease tiredness, but it does not fully replace the deep sleep of a normal night, which is when most testosterone is released. Steady overnight sleep matters more than catching up during the day.

Can improving my sleep raise low testosterone?

Better sleep can support healthy hormone levels, but it will not always correct clinically low testosterone on its own. If symptoms persist despite good sleep, a doctor can test your levels and look for other causes.

Is snoring linked to low testosterone?

Heavy snoring can be a sign of obstructive sleep apnoea, which often appears alongside low testosterone. Much of that link relates to weight and age, so a doctor will assess the whole picture rather than one symptom.

Should I get my testosterone tested?

If fatigue, low libido or low mood continue after your sleep improves, testing is reasonable. A doctor uses a morning blood test to confirm low testosterone and to identify what is driving it.

References

• Sleep Foundation. The Link Between Sleep and Testosterone. https://www.sleepfoundation.org/physical-health/sleep-and-testosterone
• Wittert G. The relationship between sleep disorders and testosterone in men, 2014. https://pmc.ncbi.nlm.nih.gov/articles/PMC3955336/
• Healthdirect. Low testosterone. https://www.healthdirect.gov.au/low-testosterone
• Sleep Health Foundation. How much sleep do you really need. https://www.sleephealthfoundation.org.au/sleep-topics/how-much-sleep-do-you-really-need