II-IV channel polysomnography. Polysomnography should only be performed by technicians and technologists who are specifically accredited in sleep medicine. However, at times nurses and respiratory therapists perform polysomnography without specific knowledge and training in the field.

Polysomnography data can be directly related to sleep onset latency (SOL), REM-sleep onset latency, number of awakenings during the sleep period, total sleep duration, percentages and durations of every sleep