>>13210315>Sleep on sideBroader shoulders put you at a higher risk for scoliosis
>Sleep on stomachTits and cock are squashed, less oxygen intake
>Sleep on backBoth ears are exposed, allowing you to be roused from sleep from both directions through noise. Can easily become upright depending on core strength.
>It makes no sense from an evolutionary perspective to sleep on your backYeah it doesn't if you're a fattie who suffers from Obstructive Sleep Apnea, but most of the world doesn't have this problem lardo.
