Sleep medicine deals with the causes, diagnosis and treatment of sleep disorders. A sleep medicine physician treats problems such as sleep apnea and snoring, insomnia and narcolepsy. Sleep apnea is when a person actually stops breathing for a few seconds during sleep, and is usually accompanied by loud snoring. Narcolepsy is a disorder of the central nervous system, and is characterized by excessive daytime sleepiness, and a tendency to sleep at inappropriate times, even if the person gets adequate nighttime sleep. Also considered sleep disorders are periodic limb movements and restless legs.

Treatment includes overnight study in a sleep center, where technicians observe, monitor, and analyze brain activity, respiratory function, muscle function and other variables that help diagnose complex sleep disorders. Sometimes a physician may fit a patient may with a device to measure a person's activity, their environmental temperature, light levels and mood state, all recorded by a computer the size of wrist watch. This allows the physician to get objective, accurate data on the patient's daily life, and help to assess sleep problems.

Doctor density varies by specialty and location. Maryland has 35 practicing sleep medicine doctors. Broken out by city, sleep medicine doctor density in Annapolis is 3, in Baltimore is 18, in Bel Air is 3, in Bowie is 1, in Brooklyn is 1, in Cheverly is 1, in Columbia is 1, in Cumberland is 1, in Eldersburg is 1, in Finksburg is 1, in Frederick is 2, in Gambrills is 1, in Glen Burnie is 1, in Halethorpe is 1, in Hollywood is 1, in Mountain Lake Park is 1, in Olney is 1, in Owings Mills is 1, in Salisbury is 1, in Towson is 4, and in Westminster is 3.

Maryland was one of the thirteen original colonies, and achieved statehood in 1788. Maryland’s population is 5,600,388; Annapolis is its capital and home to the U.S. Naval Academy. Baltimore is the largest city, and is home to world-acclaimed Johns-Hopkins University and Hospital. There are myriad activities available for residents or visitors, including arts and theater, sports, museums, hiking, biking and walking trails, Famous people from Maryland include musician Frank Zappa, baseball great Babe Ruth, and Francis Scott Key, who wrote the “The Star-Spangled Banner.”

According to 2005 Census estimates, Maryland has a population of 5,600,388. Of this population, 1,360,481 are under the age of 18 and 641,040 are at or above the age of 65.