Why Dogs Can’t Sleep at Night

Aging and Disrupted Sleep Cycles

As dogs age, their sleep-wake cycles change, similar to humans. Older dogs may sleep less deeply and wake more often during the night. This shift is linked to neurological and hormonal changes affecting their internal body clock. These changes can lead to frequent awakenings and restlessness, especially if the dog is already experiencing cognitive decline.

Dogs with cognitive dysfunction (CCD) often show nighttime waking as the most common symptom. Poor sleep can worsen cognitive function, creating a cycle where confusion and anxiety lead to more wakefulness. Disorientation or fear when waking at night may cause whining, barking, or pacing.

Pain and Physical Discomfort

Joint diseases like osteoarthritis or musculoskeletal problems can make it hard for older dogs to rest comfortably. They may struggle to get into or out of favorite sleeping spots, such as sofas or beds. Pain from dental, abdominal, or other sources can also disrupt sleep. Notably, sleep deprivation increases pain sensitivity, making the problem worse over time.

Older dogs also have a harder time regulating body temperature. They may feel cold at night, especially in unheated areas, which can keep them awake or cause them to seek warmth near their owners.

Sensory Decline and Nighttime Anxiety

Vision and hearing loss are common in aging dogs and can disrupt sleep. In people, vision loss affects the sleep-wake cycle, and the same may be true for dogs, though this hasn’t been directly studied. Hearing loss may contribute to cognitive decline and increase anxiety, especially when dogs wake up and can’t orient themselves.

Sensory decline can reduce a dog’s ability to interact with toys or people, leading to reduced daytime activity. Less activity during the day can result in excess energy and restlessness at night.

Lack of Daytime Stimulation

Dogs that don’t get enough physical or mental stimulation during the day may become wakeful at night. This is especially true for dogs that sleep a lot during the day. Without tiredness, they may act out at night to gain attention.

For adult dogs, a vigorous morning walk and evening exercise, training, and interaction can help them settle at night. In some cases, melatonin supplements may help regulate sleep patterns, but a vet should be consulted before use.

Normal Sleep Patterns in Dogs

Dogs naturally have more sleep-wake cycles than humans. One study found dogs averaged 23 cycles per night over eight hours—about 16 minutes of sleep followed by 5 minutes awake. Dogs in fenced yards slept longer than those free to roam. This frequent cycling is normal, but excessive restlessness or vocalization may signal a problem.

Dogs also respond to sounds during sleep, especially barking, and may bark in response to noises like other dogs or loud sounds—even if they’re not fully awake. This can disturb owners and contribute to perceived restlessness.