SYMPTOM
Night waking or restlessness
Waking, pacing, or vocalising during nighttime hours when previously sleeping through the night.
Cognitive Decline
Disruption of the sleep-wake cycle is one of the most commonly reported features of age-related cognitive dysfunction in dogs and cats. The normal circadian rhythm may become fragmented, with the animal sleeping more during the day and becoming restless, pacing, or vocalising at night. This reversal of the normal diurnal pattern is thought to reflect changes in the brain regions and neurotransmitter systems that regulate sleep architecture. The nighttime restlessness may be accompanied by apparent confusion, aimless wandering, or distressed vocalisation, and tends to worsen progressively over months.
Pain or Discomfort
Chronic pain that is manageable during the distractions and activity of daytime may become more apparent during the quiet of night, when there is nothing to redirect the animal's attention away from its discomfort. Musculoskeletal pain, particularly from arthritic conditions, may worsen after the stiffness that develops during prolonged lying. Abdominal discomfort, dental pain, or headaches may similarly intensify during nighttime hours. The animal may pace, reposition frequently, pant, or be unable to find a comfortable sleeping position.
Anxiety
Generalised anxiety, separation-related distress, noise sensitivity, or phobias can disrupt nighttime rest. Animals with heightened anxiety may be hyper-vigilant during the night, responding to subtle sounds, shadows, or perceived threats that do not register during the busier daytime environment. Changes in the household — new living arrangements, the absence of a family member, or alterations to the sleeping environment — can trigger nighttime anxiety. The restlessness may include pacing, attention-seeking, whining, or attempts to access the owner's bedroom.
Medical — Need to Eliminate
Conditions producing increased urine output or gastrointestinal urgency can disrupt sleep by creating a physiological need to eliminate during the night. Kidney disease, diabetes mellitus, hyperadrenocorticism, urinary tract infections, and inflammatory bowel conditions can all produce nighttime waking driven by the need to urinate or defecate. The restlessness in these cases may follow a recognisable pattern — the animal wakes, shows signs of urgency, and settles once it has eliminated — that distinguishes it from the aimless nighttime activity seen in cognitive decline.
Sensory Decline
Progressive loss of vision or hearing can make the nighttime environment more disorienting and anxiety-provoking. An animal with reduced vision may be more affected by darkness than it was previously, becoming uncertain of its surroundings when ambient light levels drop. Hearing loss may alter the animal's perception of the nighttime environment, either removing the reassuring sounds of household activity or making unexpected sounds more startling. These sensory changes may produce nighttime anxiety that manifests as restlessness, vocalisation, or seeking proximity to the owner.
Why timing matters
Early observation
Early nighttime restlessness may present as occasional disrupted nights interspersed with normal sleep patterns. The animal may wake once during the night, pace briefly, and resettle, or may simply sleep less soundly than previously. These early changes may be attributed to environmental factors, temperature changes, or random variation before a pattern becomes apparent. Noting how frequently the disrupted nights occur, what time the restlessness begins, how long it lasts, and what the animal does during wakeful periods can help establish whether a meaningful pattern is developing.
Later presentation
As nighttime restlessness becomes established, the impact on the household can become significant. Regular sleep disruption affects both the animal and the humans in the home, potentially leading to fatigue, frustration, and difficult decisions about sleeping arrangements. The animal may pace for extended periods, vocalise persistently, or engage in repetitive behaviours that prevent the household from sleeping. The quality of the animal's daytime function may also change, with increased daytime sleeping, altered appetite, or reduced engagement as the chronic sleep disruption takes its toll.
The progression of nighttime restlessness varies with its underlying cause. Cognitive decline-related sleep disruption typically worsens gradually over months, with progressively more frequent and more prolonged nighttime waking episodes. Pain-related restlessness may fluctuate with the activity of the underlying painful condition. Anxiety-related restlessness may correlate with environmental stressors and may improve or worsen as circumstances change. Medical causes producing nighttime urgency tend to worsen as the underlying metabolic condition progresses. Tracking the frequency and severity of disrupted nights over weeks can reveal the trajectory.
When to explore further
Nighttime restlessness in an older animal that is accompanied by other cognitive changes — disorientation during the day, loss of house training, altered recognition of familiar people, or staring at walls — may suggest that the sleep disruption is part of a broader cognitive decline process rather than an isolated sleep problem.
When nighttime waking consistently involves the animal requesting to go outside to urinate or defecate, and the urgency appears genuine rather than habitual, the pattern may suggest a medical condition producing increased elimination needs rather than a primary sleep or behavioural disturbance.
Nighttime restlessness accompanied by panting, frequent repositioning, reluctance to lie on certain surfaces, or difficulty finding a comfortable position may suggest that pain or physical discomfort is the primary driver, with the quiet nighttime environment allowing the discomfort to become more apparent.
When nighttime restlessness develops following a change in the household — a move, a loss of a companion animal or family member, a change in the owner's schedule, or an alteration to the sleeping environment — the temporal correlation may suggest an anxiety or adjustment component.
Nighttime restlessness that appears to begin at a consistent time each night, or that follows a predictable pattern of waking, may suggest a physiological trigger such as the timing of medication effects, the cycle of a painful condition, or a metabolic rhythm rather than random or anxiety-driven waking.
Keeping a sleep diary that records the timing, duration, and character of nighttime restlessness episodes, along with the animal's daytime behaviour and any potential contributing factors, can reveal patterns that help characterise the underlying cause. Noting what the animal does when it wakes — whether it paces aimlessly, seeks the owner, requests to go outside, appears to be in pain, or vocalises — provides context about what may be driving the wakefulness. Observing daytime sleep patterns in parallel, including whether the animal is sleeping more during the day to compensate for lost nighttime sleep, adds another dimension to understanding the disruption of the overall sleep-wake cycle.
Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS