“This suggests that cats may be more likely than dogs to create disruptions by moving on and off the bed during the night. In addition, we found that dog owners kept to more consistent bedtime and wake time schedules than cat owners and also tended to go to bed earlier and wake up earlier than cat owners,” Hoffman said.

Here’s the third and most important reason: Canines provide a sense of security to their owners. More so than with cats or even human partners.

“Some dog owners may take comfort in the thought that their dog will alert them in the case of an intruder or other type of emergency; furthermore, a dog’s bark may deter a potential intruder. A cat is less likely to take on this role, and so, may not provide psychological comfort in the same way a dog might,” said Hoffman.

The Best Partner for Quality Sleep
However, while the study suggests that dogs are the perfect slumber buddies, their benefits are subjective to each case. For example, a dog could snore or make the bed too hot. Additionally, there are many owners who find that their cats help them sleep.

Keep in mind that the research was based on how the volunteers perceive their pets’ effects on their sleeping quality and duration. As a result, more objective research is needed to definitively consider dogs the superior sleeping partners. However, Hoffman believes that these studies could be beneficial as many American households have pets.

“It will be valuable to continue this line of research so we can develop a clearer picture of the contexts under which pets and their presence in their owner’s bed may positively impact sleep quality, and the contexts under which co-sleeping with a pet may be detrimental to one’s sleep quality,” she said.

For instance, research has also shown that women sleep better while alone than with a human, but many believe in the opposite. Future research could use Fitbit-like devices to objectively track the sleep quality of people in different sleeping conditions.