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Maintenance of Wakefulness Test (MWT)

This test is usually performed to check Continuous Postivie Airwary Pressure (CPAP) compliance or to ensure
optimal treatment of sleep apnea. This test is most commonly requested by doctors for patients who are
required to have a CDL license renewed by the Department of Transportation (DOT) or another agency that
has their employees operating large equipment. A MWT is a series of 4controlled sessions approximately
1.5 hours apart. During the session, the patient sits upright in a darkened room and tries to remain alert. The
parameters recorded will help determine the patient’s level of alertness.

A standard MWT records the following parameters:

  • EEG (Electroencephalogram) – monitors brain activity to identify sleep stages
  • EOG (Electrooculogram) – records eye movement
  • EMG (Electromyogram) – records muscle activity for monitoring muscle tone
  • EKG (Electrocardiogram) – monitors heart activity