Study finds dogs and pet parents often sync up at night
Bottom line
Dogs sleeping alongside their people may be less disruptive than many pet parents assume, according to a new PLOS One study of 25 Canadian participants and 38 dogs published October 7, 2026. Researchers used actigraphy sensors over four weeks and found no significant effect of co-sleeping or bedsharing on objective human sleep duration or sleep efficiency, and no measurable effect on dogs’ nighttime activity. Still, the pairings were often behaviorally linked: 61% of human-dog dyads showed correlated nighttime activity, with human movement preceding dog movement more often than the reverse. The study also found that pet parents with multiple dogs reported worse subjective sleep, even though objective sleep measures didn’t differ. (journals.plos.org)
Why it matters: For veterinary professionals, the findings add nuance to a common client question. The data suggest that sleeping with a dog, by itself, may not meaningfully reduce sleep quality in healthy adult humans, but households with multiple dogs may perceive more disruption. The paper also reinforces that nighttime routines are shared routines: researchers concluded that humans may disturb dogs as often, or more often, than dogs disturb humans. That could matter when discussing sleep hygiene, multi-dog household management, behavior concerns, or cases where either the pet parent or the dog has medical or behavioral issues affecting rest. (journals.plos.org)
What to watch: The authors say a logical next step is comparing dog-owning households with people who don’t live with dogs, which could help clarify whether co-sleeping changes sleep outcomes relative to a non-dog baseline. (utm.utoronto.ca)
Key facts
- Study type
- PLOS One study
- Publication date
- October 7, 2026
- Sample size
- 25 Canadian participants, 38 dogs
- Method
- Actigraphy over four weeks
- Human sleep finding
- No significant effect on objective sleep duration or sleep efficiency
- Dog sleep finding
- No measurable effect on dogs’ nighttime activity
- Subjective sleep finding
- Pet parents with multiple dogs reported worse self-reported sleep quality
- Nighttime activity pattern
- 61% of human-dog dyads showed correlated nighttime activity
- Direction of movement
- Human movement preceded dog movement more often than the reverse
A new PLOS One study is pushing back on a familiar assumption in companion animal practice: that dogs in the bed or bedroom are automatically bad for human sleep. In a four-week actigraphy study involving 25 people and 38 dogs, researchers found that co-sleeping did not significantly affect objective human sleep duration or efficiency, and bedsharing specifically showed no measurable effect on either human sleep outcomes or dogs’ nighttime activity. The paper was published October 7, 2026. (journals.plos.org)
The work adds to a mixed evidence base around human-animal co-sleeping. Earlier research, including a 2017 Mayo Clinic Proceedings study, suggested that a single dog in the bedroom did not markedly impair human sleep efficiency, while dogs in the bed could be somewhat more disruptive. Other actigraphy-based work has linked dog movement with greater human movement during sleep, and broader sleep literature has shown that perceived sleep quality and objective sleep measures don’t always line up. The new study leans into that gap by measuring both movement-based sleep outcomes and pet parents’ self-reported sleep quality. (sciencedirect.com)
Researchers followed 25 Canadian participants, representing 38 human-dog pairs, using wrist-worn actigraphy for humans and collar-based accelerometers for dogs over about four weeks. According to the paper’s abstract, none of the biological or demographic variables examined significantly affected objective human sleep measures or dog nighttime activity. The standout finding was subjective: having multiple dogs was associated with poorer self-reported sleep quality, with no corresponding difference in objective sleep metrics. (journals.plos.org)
The study’s most interesting signal may be its time-series analysis of movement. Among dyads showing correlated nighttime activity, 45% showed human activity preceding dog activity, while 18% showed dog activity preceding human activity, and 36% moved within the same one-minute window. University of Toronto Mississauga’s summary of the work framed that as evidence that people and dogs are highly synchronized at night, rather than a simple one-way story of dogs waking humans. The same university piece also reported that about 72% of participants said they felt safer sleeping with their dogs. (journals.plos.org)
Author comments echoed that interpretation. In the University of Toronto Mississauga release, co-author Lavania Nagendran said the findings suggest people and dogs are “very much in sync,” and noted the disconnect between how disrupted pet parents feel and how they objectively sleep. Coverage in The Washington Post similarly quoted co-author Ming Fei Li saying the team found no objective evidence that dogs sleeping on the bed disrupted sleep more than dogs sleeping elsewhere. (utm.utoronto.ca)
There are important caveats for clinicians. The study was small, limited to healthy dogs without reported medical issues affecting activity, and relied on activity monitoring rather than full polysomnography. The authors also acknowledged that some canine movements recorded as “active” may have reflected minor sleep movements or dreaming rather than wakefulness. That means the paper is best read as a study of nighttime activity coupling, not a definitive answer on sleep architecture or causality. (doi.org)
Why it matters: For veterinarians, behaviorists, and sleep-adjacent clinicians, this is useful evidence for counseling pet parents who ask whether dogs should be excluded from the bedroom. The answer remains individualized. In otherwise healthy households, co-sleeping may not be the sleep problem many assume it is. But multi-dog homes, light sleepers, clients with allergies, chronic insomnia, PTSD, pain, or dogs with medical or behavioral conditions may still need a more tailored conversation. The broader clinical takeaway is that nighttime disruption in human-dog households appears reciprocal, and perceived sleep problems may not map neatly onto objective metrics. (journals.plos.org)
What to watch: The authors have pointed to future comparisons with non-dog households, and that would help answer the bigger clinical question: not just whether dogs and people move together at night, but whether living and sleeping with dogs changes sleep outcomes relative to households without them. Further work using larger samples, more diverse dog populations, and physiologic sleep measures would make these findings more actionable in practice. (utm.utoronto.ca)