Severe Chronic Abuse of Zolpidem in Refractory Insomnia Severe Chronic Abuse of Zolpidem in Refractory Insomnia Download Responsiveness of Veterans Affairs Health Care System to Zolpidem Safety Warnings Simplifying the Screening of Obstructive Sleep Apnea With a 2-Item Model, No-Apnea: A Cross-Sectional Study