After a long visit by her son a hospitalized woman appears to be well-oriented, calm, and attentive. Later that evening, she seems to be restless, confused, and hallucinating. This change in her mental status is typical of:

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Delirium is a temporary, reversible alteration in consciousness that often worsens in the evening, or when a susceptible person becomes otherwise physiologically or psychologically stressed. Common precipitants of delirium are medications, social isolation, ICU care, and alcohol withdrawal. Delirium is more common in the elderly than in younger adults.

After a Long Visit by Her Son a Hospitalized Woman