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A sleep specialist is a medical doctor who specializes in sleep medicine, which focuses on sleep disorders and sleep-related conditions. Sleep is essential to good health, and lack of sleep can worsen conditions such as anxiety, heart disease or diabetes. Sleep specialists may work in a hospital, office or sleep clinic or lab to diagnose and treat sleep problems. Common sleep disorders you may see a sleep specialist for include sleep apnea, insomnia, snoring and narcolepsy.