Does Sleeping Next to a Partner Change Your Sleep?

Do you sleep better beside your partner, or would you rest more easily with the bed to yourself? Here is what research on sleeping with a partner and sleep quality actually found, where it falls short, and a 2-week test you can run at home.

Short answer

Sleeping next to a partner can change your sleep, but not in one direction. A small laboratory study found slightly more REM sleep and closer sleep-stage timing when couples shared a bed, while snoring, movement and clashing schedules are common reasons people sleep worse. Your own pattern across several nights is the best guide.

Key facts

A 2020 laboratory study in Frontiers in Psychiatry (Drews and colleagues) tested 12 young, healthy couples and found REM sleep made up 23.0% of sleep when they shared a bed versus 21.0% when they slept alone.
In that study, total sleep time and deep sleep did not differ significantly, and limb movements were higher during shared sleep (61.5 versus 50.9).
A 2016 overview of couple sleeping (Richter and colleagues) concluded that effects on sleep quality are mixed and not uniformly positive.
The NHS lists breathing that stops and starts, and gasping or choking noises, as warning signs of sleep apnoea and advises seeing a GP.
Most evidence in this area is small, from young healthy people, or based on self-reports, so it cannot tell any one couple what to do.

In this article

Does sleeping with a partner change your sleep?
What else does research say about couples and sleep?
What are the downsides of sharing a bed?
When is a partner's snoring a medical issue?
Is it fine to sleep apart some nights?
How can you compare shared nights with apart nights?
Frequently asked questions
Final thoughts
Sources and further reading

Does sleeping with a partner change your sleep?

Sleeping with a partner does change sleep in measurable ways, but the changes found so far are small and mixed. The best-known laboratory study found slightly more REM sleep and more closely matched sleep stages in couples who shared a bed, alongside a little more movement. Real homes, ages and relationships vary far more than a lab does.

What the lab study found

Drews and colleagues published their study in Frontiers in Psychiatry in 2020. Twelve heterosexual couples (24 people, average age 23.5) spent four nights in a sleep laboratory over two consecutive weekends. On some nights they slept together and on others they slept alone, in an order that was balanced across couples. Both partners wore polysomnography equipment, which records brain waves, eye movements and muscle activity.

REM sleep made up 23.0% of sleep during shared nights and 21.0% during solo nights, a difference the authors reported as statistically significant (p = 0.005). REM sleep was also less broken up, with 5.4 disruptions on shared nights compared with 8.5 on solo nights. Uninterrupted REM stretches averaged 22.0 minutes together and 13.4 minutes alone.

What did not change, and what got worse

Total sleep time did not differ significantly between conditions (p = 0.423), and neither did deep slow-wave sleep (p = 0.508). Limb movements were higher on shared nights (61.5 versus 50.9, p = 0.007), so sharing a bed was not simply calmer.

The partners' sleep stages also lined up more closely. The authors' synchronisation measure was 46.9% on shared nights versus 36.6% on individual-sleep nights. Those with lower levels of social support showed a bigger REM difference between conditions.

Limits of the lab study

The authors note a small sample, and the couples were young, healthy and heterosexual, sleeping in an unfamiliar laboratory. Whether the results apply at home, in older couples, or in couples with sleep problems is unknown. A 2 percentage point difference in REM share is also a small shift, and the study cannot show that it changes how rested anyone feels.

What else does research say about couples and sleep?

Other research on couples and sleep describes a two-way relationship between sleep and relationship quality, with mixed effects on sleep itself. Reviews in this field stress that most adults share a bed, yet sleep science has long studied individuals alone. The evidence is still developing and often relies on questionnaires.

A 2016 overview by Richter and colleagues examined how sharing a bed relates to relationship quality and sleep. It noted that millions of adults share a bed, that doing so can foster intimacy, and that the consequences for sleep quality and health are mixed. The authors also pointed out that people are often unaware of how much their partner disturbs them at night.

Couple asleep side by side under a white duvet

The main downsides of sharing a bed are snoring, restless movement, mismatched sleep schedules and different comfort needs such as room temperature. Any of these can cut into one person's sleep without the other noticing. None means a relationship is in trouble, and most have practical fixes.

Waking at odd hours is common whether you share a bed or not, as covered in why you wake up at 3 am: causes and fixes.

Noise and movement

Snoring is the classic complaint. The NHS suggests that a partner can try earplugs if snoring affects their sleep, and that lifestyle changes may reduce the snoring itself. Restless legs, frequent turning and nighttime trips to the bathroom can add to the disruption, and the Drews study did record more limb movements on shared nights.

Schedules, temperature and mattress

An early riser and a night owl will often wake each other. The NHS advises keeping to similar sleep and wake times each day, which is hard when partners work different shifts. Bedroom conditions matter too: NHS guidance on insomnia warns that a room that is too hot or too cold can disturb sleep, and recommends a dark, quiet room with a comfortable mattress, pillows and covers.

When is a partner's snoring a medical issue?

A partner's snoring becomes a medical issue when it comes with breathing that stops and starts, gasping or choking noises, or heavy daytime sleepiness. Those can be signs of sleep apnoea, a condition that is hard to spot in yourself. Anyone noticing them should speak to a GP rather than only buying earplugs.

The NHS describes the warning signs of sleep apnoea as breathing that stops and starts during sleep, and making gasping, snorting or choking noises. The NHS also says it can be hard to tell if you have sleep apnoea, which is why a bed partner can be so useful as an observer.

The NHS advises seeing a GP if you or someone you share a bed with notices these signs, and suggests bringing the partner along to the appointment. It adds that untreated sleep apnoea can be difficult for a partner and put a strain on the relationship. Its snoring page also advises seeing a GP if lifestyle changes are not helping or if snoring is disrupting daily life.

Myth vs fact

Myth: Sleeping together always improves sleep, or always ruins it.

Fact: Research points both ways. One small lab study found slightly more REM sleep in couples sharing a bed, and a review found mixed effects on sleep quality. Snoring or breathing pauses are a separate matter and deserve medical advice.

Luna Band

Compare your own shared nights with your apart nights

Luna Band tracks your sleep, heart rate, HRV, readiness and recovery, so each partner can look at their own numbers on shared nights and apart nights. It cannot say why a night differed, and it does not detect or measure a bedmate. Luna reports 96.5% heart rate accuracy against a Polar chest strap (company-reported), and also states that no sensor is right for every body in every moment.

Explore Luna Band ↗Read Luna's accuracy validation

Is it fine to sleep apart some nights?

Sleeping apart on some nights is a legitimate choice that many couples make, and it does not by itself signal a relationship problem. If snoring, schedules or restlessness are costing one person sleep, a few nights in another bed can help. It can also be a short-term fix while you look into a cause.

A new room can feel strange for a night or two, which is explained in why you sleep badly the first night in a new place.

Shared nights versus apart nights: what to compare (illustrative example, not real data)
What to note	Shared night example	Apart night example	What it might suggest
Morning rating (1 to 5)	3	4	Rested a little better apart
Times woken	2	1	Fewer disturbances apart
Time to fall asleep	25 minutes	15 minutes	Settling faster alone
Mood and closeness next day	Warm	Neutral	Sharing may have its own value

Woman sleeping peacefully with her partner behind her

How can you compare shared nights with apart nights?

You can compare shared and apart nights by alternating them for two weeks, keeping other habits steady, and noting how each of you feels in the morning. A single night proves little, so the aim is a pattern across several nights. Each partner should judge their own sleep, since one person may gain while the other loses.

If you use a tracker, your heart rate and HRV trends add context. See what HRV is and why it matters for what those numbers can and cannot tell you.

Try this: 7-day experiment (run it twice for a 2-week comparison)

Pick a pattern, such as sharing a bed on odd nights and sleeping apart on even nights. Keep bedtime, caffeine, alcohol and screen habits as steady as you can.
Week one: follow the pattern. Week two: reverse it, so each night type falls on different days of the week.
Each morning, each partner writes down a 1 to 5 rating of how rested they feel, how long it took to fall asleep, and how many times they woke.
Note anything that might explain a night: snoring, a hot room, a late meal, a late bedtime, or an argument.
If you use a tracker, compare your own sleep, heart rate and HRV trends between the two night types. These are patterns to explore, not proof of cause, and a tracker cannot say why a night differed.
After 14 days, compare averages for each night type, then talk through the results together. If nothing differs, that is a useful answer too.

Frequently asked questions

Do couples who sleep together sleep better?

Not necessarily. One small laboratory study found slightly more REM sleep and more continuous REM in young, healthy couples sharing a bed, but total sleep time was unchanged and movement was higher. A 2016 overview concluded the effects on sleep quality are mixed, so it depends on the couple.

Is it bad for a relationship to sleep in separate beds?

Not by itself. Sleeping apart is a practical choice many couples make for snoring, schedules or restlessness, and no good evidence says it harms relationships on its own. What matters is whether both partners feel connected and rested, so talk honestly about how it is working for each of you.

How do I stop my partner's snoring from waking me?

The NHS suggests trying earplugs if snoring affects your sleep, and encourages the snorer to look at lifestyle changes. If snoring is loud and ongoing, or comes with gasping, choking or paused breathing, see a GP, ideally with the partner who noticed the signs.

Can a bed partner tell if I have sleep apnoea?

A partner can notice warning signs, but only a clinician can assess the cause. The NHS says it can be hard to tell if you have sleep apnoea, and that breathing stopping and starting, or gasping and choking noises, are signs worth reporting. Seeing a GP together can help.

What temperature should a shared bedroom be?

The NHS does not give a single figure, but it warns that a room that is too hot or too cold can disturb sleep. If partners disagree, separate duvets or blankets let each person adjust their own warmth, and opening a window can cool a room where safe.

Does sleeping apart mean we will sleep better?

It may, if a partner is the main disturbance, but there are no guarantees. Poor sleep can come from stress, light, noise, temperature or a medical cause. Test it for two weeks and compare how rested each of you feels, and see a GP if sleep problems last for months.

Final thoughts

Here is the short recap.

A small lab study found slightly more REM sleep in couples sharing a bed, but the evidence is limited and the effects across studies are mixed.
Snoring, movement, schedules and temperature are common downsides, and sleeping apart some nights is a legitimate choice.
Gasping, choking or paused breathing during sleep is worth raising with a GP.

Your turn: Do you sleep better beside your partner or on your own, and what helped you decide? Tell us in the comments.