80% of Aussie Couple are ‘Sleep Divorcing’ and Summer Heat might be the Real Relationship Test

As warm nights linger into early autumn, new research reveals Australian couples are spending an average of 92 nights a year sleeping apart, turning bedtime into an unexpected relationship battleground.

If you have ever found yourself dramatically relocating to the couch because someone insisted on pointing the fan directly at your face, you are not alone.

According to new nationwide research commissioned by Shark, Australia may quietly be entering the era of the “sleep divorce”, where couples choose separate sleeping spaces simply to get a decent night’s rest.

And it is happening far more often than most people would expect.

Bedtime is becoming a relationship battleground

For many couples, bedtime used to be the quietest part of the day.

Now it can feel more like a negotiation.

One partner wants the air conditioning set to arctic levels while the other is reaching for another blanket. Someone snores. Someone tosses and turns like they are rehearsing for a gymnastics routine. Eventually someone quietly relocates to the spare room just to get some sleep.

While it might sound dramatic, what people are calling “sleep divorce” is usually just couples trying to manage comfort and exhaustion.

Couples are spending 13 weeks a year sleeping apart

The Shark Sleep Divorce Study reveals that four in five Australian couples, equivalent to 80 percent, have slept separately from their partner at some point.

Couples are spending an average of 92 nights per year apart, which is the equivalent of roughly 13 weeks annually sleeping solo.

Almost half of couples, 49 percent, say they sleep apart at least one night in a typical summer week.

The trend highlights just how disruptive sleep challenges can become inside a relationship.

Summer heat is disrupting sleep across Australia

As Australia transitions from peak summer into early autumn, warm evenings continue to affect sleep.

The research found that 61 percent of couples struggle to get quality sleep during summer.

Temperature is one of the most common triggers for sleep disruption. One partner overheats while the other feels comfortable. One wants a fan on all night while the other finds the noise distracting.

Small differences in comfort quickly become big differences in sleep quality.

Heat is also affecting intimacy

The consequences of poor sleep are not limited to exhaustion.

According to the study, 59 percent of Australian couples say they have skipped or would skip bedtime intimacy because of heat.

For many couples, bedtime is the only quiet window they have together after work, school runs and family routines. When that moment disappears due to discomfort or fatigue, connection can start to suffer.

When poor sleep starts affecting relationships

Sleep expert Olivia Arezzolo says disrupted sleep has a clear impact on relationships.

“Sleep disruption doesn’t just make us tired, it directly impacts mood, patience and emotional connection,” Arezzolo explains.

Data from the study supports this.

Ninety two percent of Australians say quality sleep makes them more understanding and less irritable in their relationship.

More than one in three respondents, 37 percent, say lack of sleep has made them snappy with their partner. The same number say their partner’s sleep habits, including snoring or tossing and turning, have caused relationship tension.

Why “sleep divorce” might not be the best long term solution

Although sleeping separately may provide temporary relief, Arezzolo cautions that it should not become the default long term solution.

“A sleep divorce should be used in emergencies only, as sleeping together supports oxytocin release, which is our love hormone,” she says.

Oxytocin helps lower cortisol levels in the body. Elevated cortisol is linked to disrupted sleep patterns including waking during the night or difficulty falling asleep.

Sleeping together can therefore support both emotional connection and better sleep over time.

Three expert tips to protect both sleep and relationships

Instead of abandoning the shared bedroom entirely, experts recommend focusing on improving the sleep environment.

Arezzolo shares three practical ways couples can protect both their sleep and their relationship.

Personalised cooling instead of compromise

“Couples often fight over fan direction or temperature,” Arezzolo says.

“Personalised, directional cooling allows airflow to be aimed exactly where it is needed or circulated across the whole room.”

Devices such as the Shark TurboBlade Ultra Powerful Bladeless Tower Fan allow airflow to be adjusted through dual vents and multi directional oscillation, helping couples stay comfortable without disturbing each other.

Treat sleep like date night

Sleep is often sacrificed once the day becomes busy.

Arezzolo recommends treating sleep as a shared priority.

Going to bed at a similar time, winding down together and creating a calm environment can help couples feel more rested and emotionally connected the next day.

Consistent airflow can help the body stay asleep

Consistent, gentle airflow can help the body regulate temperature overnight.

Products such as the Shark TurboBlade Fan feature Air Blanket Mode technology, which delivers a soft and even breeze across the bed to help couples stay cool without constantly adjusting the fan or thermostat.

Can better sleep actually strengthen relationships

The research suggests the answer may be yes.

When couples sleep better they report improved patience, better communication and a greater sense of emotional connection.

For parents especially, where sleep can already feel like a luxury, creating a comfortable bedroom environment may be one of the simplest ways to protect both rest and relationships.

Sometimes it is not the big relationship gestures that make the difference.

Sometimes it is simply making sure both people can sleep through the night without arguing about the fan.

Product information
The Shark TurboBlade Ultra Powerful Bladeless Tower Fan is available now for RRP $399.99 at sharkclean.com.au and leading retailers.

Study methodology
The study was conducted online between 1 and 8 December 2025 among a nationally representative sample of 2,039 partnered adults aged 18 and over across Australia and New Zealand. Results were weighted by age, gender and region to reflect population estimates and are reported at a 95 percent confidence interval.

Disclaimer: All thoughts and experiences shared are based on available research and expert commentary.