Guest at Arizona's ultra-posh Canyon Ranch, for example, can spend a night in a sleep lab, where doctors monitor their sleep patterns using polysomnography tests. (canadianbusiness.com)
Sleep stages were identified by polysomnography, attaching a set of electrodes to the head for physiological recordings during sleep. (sciencedaily.com)
The group used a combination of monitoring methods collectively known as polysomnography to check whether the participants were in the rapid eye movement (REM) state of sleep, in which we tend to have most of our dreams. (newscientist.com)