Figure 1.

Experimental Design Schematic. Subjects (n = 54) spent the first seven nights with temperature regulation off (Pod OFF Baseline) and then spent seven nights with temperature regulation on (Pod ON), followed by the last two nights with temperature regulation off (Pod OFF End). “No Pod Cover” means that subjects slept on their own bed without the Pod cover installed. “Pod Cover” means that subjects were sleeping with the Pod cover on their bed, either with the temperature regulation on or off. Sleep stages, sleep onset latency (SOL), sleep efficiency (SE), and total sleep time (TST) were recorded on Nights 6–9 and 13–16 through a home sleep test device (HST). Throughout the entire study, sleeping HR and HRV, along with daily exercise, were recorded via a Fitbit. Ratings of perceptual comfort and sleep quality were recorded via a daily morning survey.