polysomnography (PSG) apparatus affects PSG results by inducing subjects to sleep in the
supine position. Twelve patients found to have positional obstructive sleep apnea (OSA)
during standard PSG returned for two additional nights of study during which no PSG leads
were attached. The time spent supine was 56% greater during the PSG night than the non-
PSG nights, 195±88.6 min during the baseline PSG and 125±84.6 min during the non-PSG …