Use of Video Polysomnography
This chapter discusses the importance of audio-video signals during a sleep study. Asynchronized video recording can provide invaluable information to differentiate between parasomnia and seizures. Video can be used to detect localized movement that may be suggestive of REM sleep behavioral disorder, for example, hand movement along with chin muscle atonia. Video recording may also be used to show the movement to the bed partners and to analyze whether the movement observed in the sleep laboratory is similar to what happens at home. Sleep-related rhythmic movement disorder, seizures, parasomnia and turning in bed, especially if brief, produce similar kinds of movement artifacts. Audio forms an important part of the sleep study. Teeth grinding and sleep talking are two activities that produce similar kind of signals in the microphone channel.