Perspectives on the management of insomnia in patients with chronic respiratory disorders.

Complaints of poor sleep are very common in people with chronic respiratory disorders. In patients with chronic obstructive pulmonary disease (COPD), poor sleep may be due to many causes, including cough, excess mucous production, and frequent arousals from sleep caused by hypercapnia, as well as secondary to medications used to manage the lung disease. Patients with obstructive sleep apnea (OSA) also complain of excessive daytime sleepiness and fatigue due to poor-quality sleep, although the mechanism of sleep disruption is somewhat different from that in patients with COPD. Although benzodiazepines are often the drugs of choice for the management of insomnia, caution is suggested with the use of these agents in patients with chronic obstructive respiratory disease due to the reduction in upper airway muscle tone and blunting of the arousal response to hypercapnia. However, controlled trials with short-acting benzodiazepine receptor antagonists, including triazolam, zolpidem, and zaleplon, suggest that these agents may be safely used in selected patients who have mild to moderate COPD without daytime hypercapnia. Less data are available on the use of these agents for patients with OSA, but a preliminary trial using zaleplon suggests that respiratory function is not adversely affected in patients with mild to moderate OSA. Studies are needed to further define the benefit-risk ratio of the use of benzodiazepine receptor agonists for the management of insomnia in patients with chronic obstructive lung disease.