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  • Physiologic analyzers that simultaneously measure, record, and interpret a variety of physiologic functions during sleep. These analyzers typically perform evaluations of electroencephalography, electrocardiography, electro-oculography, electromyography, respiration, temperature, and pulse oximetry readings; usually, they also provide audiovisual information about the sleeping patient for behavioral analysis. Some analyzers also perform additional evaluations according to the study needs, such as gastroesophageal reflux, bedwetting (enuresis), or penile tumescence. Somnography analyzers consist of electrodes and instruments that measure physiologic activities; a headbox that includes samplers, filters, and amplifiers; and appropriate software for processing and patient reporting. These analyzers are used in the diagnostic evaluation of sleep and sleep-related disorders, such as difficulty falling asleep (insomnia), difficulty staying awake (hypersomnia), apnea, and other sleep disorders associated with medical or psychiatric conditions.
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