The Yawkey building entrance has closed.

As of April 29, BMC’s Yawkey building doors are closed as an entrance. All patients and visitors on our main campus must enter the hospital via the Shapiro, Menino, or Moakley buildings, where they will be greeted by team members at a new centralized check-in desk. Learn more.

Sleep studies, called polysomnograms, are used to diagnose sleep disorders. The test records a patient's brain waves, blood oxygen levels, heart rate and breathing, as well as eye and leg movements.