system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are different sleeping positions comfortable for different people? Does it have to do with how we were comfortable in our mother's womb?
gpt
It definitely isn't related to how we were in our mother's womb, but many factors can influence how people are comfortable. For example many women find a pillow between their legs is more comfortable as their hips are wider than men's and the spacing keeps their legs comfortable on their side. Why their side? Larger breasts can put weight on their chest so offloading it by turning to the side makes breathing easier.

Men tend to have wider shoulders which can make laying on their side less comfortable as it bends the spine more. All these are just examples though as it comes down to personal preference.