Humans have a preferred sleeping position that provides physiological benefits

The claim posits that humans have a preferred sleeping position that provides physiological benefits. Paper [9] establishes that side sleeping in late pregnancy provides a significant physiological benefit (reduced risk of stillbirth), and Paper [1] demonstrates that sleep positions have real physiological consequences (such as supine posture being associated with increased angina frequency). Paper [0] discusses tracking body posture and movement during sleep, and Paper [5] evaluates PPG signal patterns in different sleep postures, showing that posture choices intersect with physiological monitoring and events. Thus, the literature supports the idea that sleep positions have physiological consequences and benefits.