Willamette Sleep Center Medical Director Mark T. Gabr M.D., D-ABSM Willamette Sleep Center is a comprehensive, state-of-the-art sleep disorders clinic and laboratory. Sleep Disorders According to the 2005 Sleep in America poll conducted by the National Sleep Foundation,* 21 percent of American adults believe they have a sleep problem. Some of the most common sleep disorders associated with these problems are: • Sleep Apnea • Insomnia • Narcolepsy • Restless Legs Syndrome • Periodic Limb Movement Disorder • Rapid Eye Movement (REM) Behavior Disorder • Circadian Rhythm Disorders *The National Sleep Foundation is an independent, nonprofit organization that works to increase the understanding of sleep and sleep disorders by supporting education, research, and advocacy.