and is the principal investigator on research managed by Baylor College of Medicine including contract research from Evotec, Neurogen, Sanofi-Aventis, GlaxoSmithKline, Merck, Takeda, NBI, Respironics, and Organon. Dr. Harsh is on the advisory board for Cephalon. Dr. Chervin is on the scientific advisory board of Pavad Medical and is a consultant for Alexa Pharmaceuticals. Mr. Butkov has financial interests in the School Of Clinical Polysomnography, Inc. and Synapse Media. Dr. Vitiello is on the speakers bureau for Takeda. Dr. Kushida is an investigator on research managed by Stanford University including contract research from GlaxoSmithKline, Boehringer-Ingelheim, XenoPort, Inc., Schwarz Pharmaceuticals, and Kyowa Pharmaceuticals and has received travel grants from XenoPort, Inc. for oral presentations. Drs. Kryger, Malow, Silber, and Chesson have reported no financial conflicts of interest.

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This chapter provides an overview of the sleep recording process, including the application of electrodes and sensors to the patient, instrumentation, signal processing, digital polysomnography (PSG), and artifact recognition. Topics discussed include indications for PSG, standard recording parameters, patient preparation, electrode placement for recording the electroencephalogram (EEG), electrooculogram (EOG), electromyogram (EMG), and electrocardiogram (ECG), the use of respiratory transducers, oximetry, signal processing, filters, digital data display, electrical safety, and patient monitoring. This chapter also includes record samples of the various types of recording artifacts commonly found in sleep studies, with a detailed description of their causes, preventative measures, and recommended corrective actions.