A nurse is caring for a 78-year-old client with moderate Alzheimer's disease who has been exhibiting increased agitation and wandering behavior during the evening hours. The client's family reports that these behaviors have worsened over the past week. What is the most appropriate initial nursing intervention?

The client is exhibiting a classic pattern of sundowning, a circadian rhythm disturbance common in Alzheimer's disease and related dementias (ADRD) where agitation, confusion, and wandering intensify during the late afternoon and evening hours. The underlying pathophysiology involves degeneration of the suprachiasmatic nucleus (SCN), the brain's master clock, which disrupts the sleep-wake cycle and leads to a misalignment between internal biological rhythms and external environmental cues ^[3]. Nonpharmacological interventions that target this disrupted circadian system by providing structured, predictable external cues are the first-line approach to managing behavioral and psychological symptoms of dementia (BPSD) [1,3].

A consistent evening routine with calming activities directly addresses the root cause by reinforcing the natural circadian drive for sleep and reducing the sensory confusion that can trigger agitation. This aligns with evidence that timed, predictable environmental stimuli can consolidate sleep and reduce evening agitation without the risks associated with pharmacological solutions ^[3]. In contrast, pharmacological restraint with lorazepam (Option 1) carries significant risks in older adults, including paradoxical agitation, oversedation, and increased fall risk, and does not correct the underlying circadian dysregulation. Physical restriction (Option 2) is a form of restraint that violates client rights, can escalate fear and agitation, and is never an appropriate initial intervention. Increasing environmental stimulation (Option 3) is contraindicated because excessive or unpredictable noise and light can act as an environmental trigger for specific subtypes of agitation in people with dementia, overwhelming their already compromised sensory processing ^[2].

The scoping review by Au-Yeung et al. confirms that indoor environmental quality parameters, such as light and noise, are directly associated with BPSD and that controlling these parameters is a key management strategy ^[1]. Specifically, a structured routine helps modulate the timing of light exposure, which is a critical zeitgeber (time-giver) for the circadian system. Figueiro's work further supports that timed light exposure and consistent daily patterns can improve nighttime sleep efficiency and reduce evening agitation in ADRD patients ^[3]. By establishing a predictable sequence of calming activities, the nurse is essentially providing a nonpharmacological, environmental intervention that reduces the sensory triggers for agitation ^[2] while strengthening the client's weakened circadian signaling ^[3].