Like humans, dogs found to have fitful sleep after negative experiences

October 25, 2017 by Bob Yirka, report
Credit: CC0 Public Domain

A team of researchers from several institutions in Hungary has found that dogs, like humans, very often have sleep problems after experiencing emotional difficulties. In their paper published in Proceedings of the Royal Society B, the group describes their study of sleeping dogs and what they found.

Most people know by experience that stressful days can lead to sleepless nights, but little work has been done, the researchers note, to find out if the same is true for other animals. In this new effort, they sought to learn more by recording of sleeping dogs.

To find out if in dogs change due to stressful situations prior to sleeping, the researchers enlisted the assistance of 16 pet dogs of different breeds and their owners. Each of the dogs was subjected to either a positive or . A positive experience was something the dog was known to like, such as being petted or engaging in playing catch. Negative experiences included being tied to a door for a length of time while being ignored by the owner or having a researcher stare threateningly directly into its eyes.

All of the dogs were fitted with EEG sensors, and after their positive or negative experiences, were allowed to go to a designated place to sleep.

The researchers report that the dogs that had experienced a stressful event went to sleep approximately twice as fast as the relaxed dogs, a behavior that has been seen before. Prior research suggests dogs attempt to separate themselves as quickly as possible from their stressful feelings. All of the dogs were allowed to sleep up to three hours as researchers monitored their brain waves. The researchers found that those dogs that had undergone negative experiences spent on average 20 fewer minutes of deep sleep than the dogs that had positive experiences. They did not spend it awake, however, instead, they simply had more minutes of REM sleep.

The researchers suggest that a single bad night for a dog is not likely to cause much of a problem, but if negative experiences occur regularly, it could spell trouble—past studies have shown that , like humans, retain knowledge better when they get a good night's sleep.

Explore further: Are you barking up the wrong tree by sleeping with your dog?

More information: Anna Kis et al. Sleep macrostructure is modulated by positive and negative social experience in adult pet dogs, Proceedings of the Royal Society B: Biological Sciences (2017). DOI: 10.1098/rspb.2017.1883


The effects of emotionally valenced events on sleep physiology are well studied in humans and laboratory rodents. However, little is known about these effects in other species, despite the fact that several sleep characteristics differ across species and thus limit the generalizability of such findings. Here we studied the effect of positive and negative social experiences on sleep macrostructure in dogs, a species proven to be a good model of human social cognition. A non-invasive polysomnography method was used to collect data from pet dogs (n = 16) participating in 3-hour-long sleep occasions. Before sleep, dogs were exposed to emotionally positive or negative social interactions (PSI or NSI) in a within-subject design. PSI consisted of petting and ball play, while NSI was a mixture of separation, threatening approach and still face test. Sleep macrostructure was markedly different between pre-treatment conditions, with a shorter sleep latency after NSI and a redistribution of the time spent in the different sleep stages. Dogs' behaviour during pre-treatments was related to the macrostructural difference between the two occasions, and was further modulated by individual variability in personality. This result provides the first direct evidence that emotional stimuli affect subsequent sleep physiology in dogs.

Related Stories

Study tests how well humans interpret dog growls

May 17, 2017

(—A team of researchers with Eötvös Loránd University in Hungary has conducted a study regarding how well humans interpret dog growls. In their paper published in Royal Society Open Science, the group reports ...

Recommended for you

Microbial dark matter dominates Earth's environments

September 26, 2018

Uncultured microbes—those whose characteristics have never been described because they have not yet been grown in a lab culture—could be dominating nearly all the environments on Earth except for the human body, according ...

Team names world's largest ever bird—Vorombe titan

September 25, 2018

After decades of conflicting evidence and numerous publications, scientists at international conservation charity ZSL's (Zoological Society of London) Institute of Zoology, have finally put the 'world's largest bird' debate ...

The grim, final days of a mother octopus

September 25, 2018

Octopuses are the undisputed darlings of the science internet, and for good reason. They're incredibly intelligent problem-solvers and devious escape artists with large, complex nervous systems. They have near-magical abilities ...

Climate change not main driver of amphibian decline

September 25, 2018

While a warming climate in recent decades may be a factor in the waning of some local populations of frogs, toads, newts and salamanders, it cannot explain the overall steep decline of amphibians, according to researchers.

Team discovers new species of dazzling, neon-colored fish

September 25, 2018

On a recent expedition to the remote Brazilian archipelago of St. Paul's Rocks, a new species of reef fish—striped a vivid pink and yellow—enchanted its diving discoverers from the California Academy of Sciences. First ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.