Although the scientific literature makes a compelling case that our pets are good for us in many ways, research into the effects of co-sleeping is more limited.
Every night around 2 a.m., my sleeping partner wakes me up because she’s thirsty and needs a bathroom break. Fortunately for her, she has no trouble going back to sleep. I know this because after this nightly ritual, I’m often wide-awake, listening to her gentle snores.
By now, you may have figured out that my bed buddy is a dog. Like many dogs around the world, Maddie, a 13-year-old Shih Tzu, is a co-sleeper who shares her bed with a human.
Various studies have estimated that about half of all pet owners allow their pets to sleep in the bed. Although the scientific literature makes a compelling case that our pets are good for us[1] in many ways, research into the effects of co-sleeping is more limited.
A small Mayo clinic[2] study of 40 adults used human and dog body monitors to measure whether having a dog in the bedroom or in the bed had an effect on sleep quality. The researchers measured sleep efficiency, which compares how many minutes you actually sleep after going to bed. (The clock doesn’t start until you close your eyes for the night — staying up to read a book doesn’t count.)
Everyone has brief periods where they wake during the night, but they often don’t even notice. Ideally, you’ll stay asleep about 85 percent of the time you’re in bed. In the Mayo study, the sleep efficiency of people whose dogs slept in the room was close to that, at about 83 percent. If a dog was sleeping on the bed, sleep efficiency dropped to about 80 percent, which is less than ideal but not bad either. Although the difference was statistically meaningful, it translates to roughly 14 minutes of lost sleep for people who sleep with their dog compared with those who had their dog in the same room.
The study’s authors noted that the dog’s sleep efficiency “was unaffected by their location.” And notably, the monitoring devices detected the dogs enjoying about two minutes of playtime each night.
Once a dog experiences sleeping in bed with a human, it can be a hard habit to break, said Alexandra Horowitz, a professor at Barnard College and author of the book, “Inside of a Dog: What Dogs See, Smell and Know.”[3]
“If you let them sleep on the bed with you, they’re going to continue to want to because it’s a nice place to sleep,” Dr. Horowitz said. “It would be extra hard not to let them.”
But allowing your pet to sleep in the bed is only a problem if it causes you distress, Dr. Horowitz said. Although some people believe that letting a dog in your bed could lead to behavior issues in the pet, there’s no evidence co-sleeping creates problems, she said. In fact, it could lead to a stronger bond with your pet.
“I think it really came from this idea that dogs should be segregated from the best parts of the house — they shouldn’t be in the kitchen, the dining room, on the couch or on the bed,” Dr. Horowitz said. “For some reason, there is this sense that we have to maintain our dominance over them by having full possession of these things. It sounds ridiculous because it is ridiculous.”
Dr. Horowitz said that when her dogs, Finnegan, a lab mix, and Upton, a Great Dane-bloodhound mix, started crowding the bed, the solution in her house was not to kick them out, but to “expand the size of our bed.”
“They’re getting older, so they can’t leap up onto the bed anymore,” she said. “We actually have to lift them onto the bed. But it’s the best place. It’s a comfy place. It’s where we are.”
Dr. Horowitz recently got a new puppy, a Schnauzer-cattle dog mix named Quiddity, who sleeps with her son. She said that if someone was having trouble sleeping because of a dog, they should try to find another cozy spot for the pet to enjoy. “They don’t have to sleep in the bed,” she said. “Find some other place as spectacularly good — or maybe they want to sleep with your son.”
One question the Mayo Clinic study didn’t address was how sleep changes for dog owners if the dog leaves the bed. On a few occasions, my dog Maddie has chosen to sleep elsewhere, and I find myself waking up even more wondering where she is. When that happens, I go find her and bring her back to bed.
When Jamie Contreras and her husband, who live near Portland, Ore., got their bulldog mix puppy, Cooper, they planned for him to sleep in a crate next to the bed. But soon, the dog made it clear he wanted to be on the bed. As the dog got bigger, it became apparent there wasn’t enough room for everybody — so the couple bought a king-size bed.
Now, nearly 12 years later, the 83-pound dog’s nightly routine includes sleeping under the covers in between Ms. Contreras and her husband. Often, the dog moves on top of the covers during the night, pinning the couple under the sheets. Sometimes, Cooper runs and kicks in his dreams.
“He’s a big dog and he moves around a lot,” Ms. Contreras said. “But I like having him there. It’s a comfort. When we travel, it’s almost hard to sleep not having him there. There are inconveniences to it, and it occasionally wakes you up, but the benefits outweigh that. I wouldn’t have it any other way.”
More from the Well Newsletter
Breaking the pain cycle
This week, my colleague Erik Vance produced a special report examining the science of chronic pain. The stories examine new efforts to understand chronic pain and help patients heal, as well as the language we use to talk about pain and how exercise can be used for relief. If you’ve suffered from pain or know someone who does, I’m sure you’ll find the series informative and helpful.
Read more:
The Pain Brain[4]
Talking about kids and Covid vaccines
I had the opportunity to talk with Dr. Uzma Hasan, the division chief of pediatric infectious diseases at Saint Barnabas Medical Center in New Jersey, and Apoorva Mandavilli, my colleague from the Science desk, about children and Covid vaccines. During our live Twitter chat, we answered a number of questions about the different vaccine doses by age group, timing and potential side effects. (The recording works only if you listen on your mobile device. You’ll need to install the Twitter app and have a Twitter account to listen.)
Listen to our conversation using your mobile device:
The Coronavirus Vaccine and Kids[5]
The Week in Well
Here are some stories you don’t want to miss:
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Gretchen Reynolds explains everything you need to know about high-intensity exercise[6].
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Jane Brody discusses the new book “Social Justice Parenting.”[7]
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Dr. Lisa Sanders shares a medical mystery solved by two strange questions[8].
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And of course, we’ve got the Weekly Health Quiz[9].
Let’s keep the conversation going. Follow me on Facebook[10] or Twitter[11] for daily check-ins, or write to me at well_newsletter@nytimes.com[12].
Stay well!
References
- ^ pets are good for us (www.nytimes.com)
- ^ small Mayo clinic (www.sciencedirect.com)
- ^ “Inside of a Dog: What Dogs See, Smell and Know.” (alexandrahorowitz.net)
- ^ The Pain Brain (www.nytimes.com)
- ^ The Coronavirus Vaccine and Kids (twitter.com)
- ^ about high-intensity exercise (www.nytimes.com)
- ^ “Social Justice Parenting.” (www.nytimes.com)
- ^ a medical mystery solved by two strange questions (www.nytimes.com)
- ^ Weekly Health Quiz (www.nytimes.com)
- ^ Facebook (www.facebook.com)
- ^ Twitter (twitter.com)
- ^ well_newsletter@nytimes.com (www.nytimes.com)
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