Which side of the bed do you sleep on?

As I'm sitting here, on the left side of the bed, I wondered if there was any actual research on this subject by gender or sorted out another way, and if there was, what the findings say about people who sleep on the left or right side.

I've historically been a left side of the bed sleeper, pretty much since I was a kid - although when I was in elementary school, right before I fell asleep, I used to be on the right side, against the wall, with my face pointed down in the gap between the mattress and the wall. I claimed (to myself) that the air there was cooler to breathe. But then I'd turn over and fall asleep in the middle of my bed, if I remember right.

But for the last 20 years or so, I've slept on the left, sometimes very near the edge of the bed.

According to the limited information I found by doing a Google search on the subject, men tend to sleep on the left side of the bed more than women. Men also sleep on the side facing the door, presumably to protect his wife. Although one website listed women sleeping toward the door so that she could wake up and get the kids. Both genders justify sleeping facing the door so that they can have a direct route to the bathroom.

I was looking more for something that described what sleeping on the right side and left side means. What's the symbolism and significance of sleeping on the right or left sides? Is one side more "powerful" than the other? Is one side the "submissive" side? It would be interesting to know.

Perhaps a surveymonkey survey is in order here.

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