Written by the Nuvirox Research Team
Key Points
- A 2025 nationwide study of older adults found that owning a pet in poor health was linked to a significantly higher risk of insomnia, even though pet ownership overall was linked to lower insomnia risk.
- Researchers point to "acute caregiver stress" — a transient spike in cortisol tied to disrupted routines — as one likely mechanism, similar to what's seen in human caregivers.
- Night checks, medication schedules, and anticipatory grief about a pet's prognosis can all independently interfere with falling and staying asleep.
Short answer: yes, and the research on pet health status backs up what you're feeling. A large 2025 study of pet owners over 60 found that while pet ownership in general was linked to a lower risk of insomnia, owning a pet in declining health flipped that benefit into a measurable risk. The companionship that normally helps you sleep gets replaced by a kind of low-grade caregiving vigilance — listening for coughing, checking a water bowl, running through symptoms in your head — that keeps your nervous system from fully powering down at night.
Why does a sick pet affect sleep so specifically?
Because the relationship runs both directions. Healthy pet ownership is associated with better sleep in several studies, largely credited to routine, physical activity, and a sense of security. Illness reverses the mechanism the same way it does in human caregiving relationships: unpredictability replaces routine, and unpredictability is one of the most reliable triggers of nighttime hyperarousal.
Researchers studying older adults and their pets described this as "acute caregiver stress" — a transient elevation in cortisol brought on by disruption to an established daily order.1 That's a very similar mechanism to what shows up in research on human family caregivers, where perceived caregiving burden (not just the caregiving tasks themselves) predicts poorer sleep on the Pittsburgh Sleep Quality Index.5 Your brain doesn't appear to draw a hard line between "family member I'm worried about" and "pet I'm worried about" when it comes to the stress-sleep pathway.
Is it the interrupted sleep, or the worry itself?
Both, and they compound each other. If your pet is sick enough to need overnight monitoring — a diabetic cat needing insulin on a schedule, a dog recovering from surgery, an animal in end-of-life hospice care — you're dealing with literal sleep fragmentation on top of anticipatory stress. Even when there's no physical interruption, the 2025 study on older pet owners found that people who spent over two hours a day interacting with their pet had a higher insomnia risk than more moderate-interaction owners, which researchers suggested may reflect underlying anxiety or hypervigilance rather than the interaction time itself.1
It's also worth naming what this actually is: many owners are moving through a form of anticipatory grief, particularly once a prognosis is discussed. That's not an overreaction. The human-animal bond activates many of the same attachment systems as human relationships, and disrupted sleep is a well-documented feature of anticipatory loss more broadly.
What human studies actually show
Pet health status and insomnia risk in older adults. A nationwide cross-sectional study of 1,434 Chinese adults aged 60 and older assessed insomnia using the Athens Insomnia Scale and found that overall pet ownership was associated with reduced insomnia risk (adjusted OR=0.75). But owners of pets in poor health faced a significantly elevated insomnia risk — the opposite direction of the general benefit — even after adjusting for the owner's own health and demographics.1 This is a cross-sectional design, so it can't establish that pet illness causes insomnia, only that the two are strongly associated.
Pet ownership and objective sleep disorders. A separate NHANES-based study of U.S. adults found dog ownership was associated with greater odds of a diagnosed sleep disorder and trouble sleeping, while cat ownership was linked to more leg jerks and lighter sleep disturbances — a reminder that even healthy pets can complicate sleep, which matters when you're trying to isolate the effect of illness specifically.2
The honest counterweight. Not every study finds pets harm sleep, and some find the opposite. A U.S. survey-based study on co-sleeping with pets found no meaningful difference in overall Pittsburgh Sleep Quality Index scores between owners who slept with their dogs and those who didn't, aside from daytime dysfunction — and some owners who felt emotionally close to their pets actually reported feeling more secure sleeping near them. The research is genuinely mixed on baseline pet ownership; the illness-specific finding is more consistent, but comes from fewer studies overall.
What a sick pet won't do to your sleep forever
Most of this is situational, not a fixed feature of pet ownership. Once a treatment plan stabilizes, a pet recovers, or you and your vet reach clarity on prognosis, the acute stress phase generally eases, mirroring what's seen in human caregiver research once a care routine becomes predictable again.
See a doctor (yours, not the vet's) if: the sleep disruption is lasting more than a few weeks, you're also noticing symptoms like persistent low mood, appetite changes, or difficulty functioning during the day. Grief — anticipatory or otherwise — that starts affecting your ability to work or care for yourself is worth discussing with a professional, separately from anything related to your pet's veterinary care.
What actually seems to help, based on the caregiving literature
Because pet-illness insomnia behaves like caregiver-stress insomnia, strategies that help human caregivers tend to translate reasonably well: keeping as much of your own routine intact as possible (fixed wake time in particular), building in short breaks from monitoring duties when a partner or family member can share the load, and separating "worry time" from bedtime by writing down tomorrow's care tasks earlier in the evening rather than running through them in bed.
Is it normal to grieve this much before my pet has even died?
Yes. Anticipatory grief is a recognized response to an impending loss, whether that loss involves a person or a pet, and sleep disturbance is one of its most commonly reported physical symptoms.
Should I stop checking on my pet overnight if it's wrecking my sleep?
Talk to your vet about which checks are medically necessary versus which are reassurance-seeking. Some overnight monitoring is genuinely required for certain conditions; some can be safely reduced once you understand the real risk window.
Does getting a second pet help distract from worrying about a sick one?
There's no research specifically testing this, and timing matters — most veterinary behaviorists advise against adding a new pet while actively managing another's illness, since it adds logistical and emotional load rather than reducing it.
Why do I sleep worse on nights I don't check on my pet at all?
This is a common pattern in anxiety research generally: avoiding a worry doesn't reduce it, it often just delays the rumination to bedtime, when there's nothing left to distract you from it.
From Nuvirox
Why we formulated Sleep+ Restore
Sleep+ Restore was built around the idea that a stressed-out night deserves a formula designed with that specific kind of night in mind — not a generic sedative, but a blend chosen to work alongside your body's own wind-down process. We're currently refining the formula further based on emerging research, so we're intentionally not listing specific ingredient amounts here; the product page always reflects the current version. What hasn't changed is our standard: try it for a full 60 days, and if it's not doing the job, send it back for a full refund — long enough to actually judge whether it helps with a stretch of nights like the ones described above, not just one.
Learn more about Sleep+ Restore →The bottom line: A sick or dying pet is a legitimate, research-backed sleep disruptor — not an overreaction. If the caregiving-stress pattern feels familiar, the same wind-down strategies described in our piece on cortisol and being "wired but tired" and the companionship research in our article on living alone and sleep may help you separate the caregiving tasks from the bedtime rumination. If you're also navigating the loss of a close friend to illness, our piece on anticipatory grief and sleep covers the human-side research in more depth.
References
- Pet ownership, pet-related characteristics, and sleep quality among older adults in China: a nationwide cross-sectional study. PMC12908031.
- The association of pet ownership and sleep quality and sleep disorders in United States adults. Human-Animal Interactions (CABI), 2023.
- Co-sleeping with pets, stress, and sleep in a nationally-representative sample of United States adults. PMC10918166.
- Simón MA, et al. Caregiver Burden and Sleep Quality in Dependent People's Family Caregivers. J Clin Med. 2019;8(7):1072. PMID: 31336559.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.