

Polysomnography can detect breathing disorders (such as obstructive sleep apnea), seizure disorders, narcolepsy, periodic limb movement disorder, and unusual movements and behaviors during sleep (parasomnias). A painless clip is attached to a finger or an ear to record oxygen levels in the blood. Imaging tests commonly used to diagnose nervous system (neurologic) disorders. Other symptoms include sleep paralysis, vivid dreams, and hallucinations while falling asleep or waking up from sleep. read more, or ECG), muscle activity ( electromyography Electromyography and Nerve Conduction Studies Diagnostic procedures may be needed to confirm a diagnosis suggested by the medical history and neurologic examination. Narcolepsy is a sleep disorder marked by excessive sleepiness during the day or recurring, uncontrollable episodes of sleep during normal waking hours, usually with sudden, temporary episodes of muscle weakness (cataplexy).

This record, the electrocardiogram (also known as an ECG). Electrodes are also attached to other areas of the body to record heart rate ( electrocardiography Electrocardiography Electrocardiography (ECG) is a quick, simple, painless procedure in which the heart’s electrical impulses are amplified and recorded. The recordings help provide doctors with information about sleep stages. In some cases, people may only experience mild weakness that causes their head or jaw to drop. It can be triggered by intense positive and negative emotions and can vary in severity from mild to more severe. read more, or EEG) as well as eye movements. Cataplexy is a sudden, uncontrollable loss of muscle tone that affects the neck, face, and knees. Electrodes are pasted to the scalp and face to record the brain's electrical activity ( electroencephalography Electroencephalography Diagnostic procedures may be needed to confirm a diagnosis suggested by the medical history and neurologic examination. Polysomnography is usually done in a sleep laboratory, which may be located in a hospital, clinic, hotel room, or other facility that is equipped with a bed, bathroom, and monitoring equipment.
