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Most mattress advice reduces to a single question: soft or firm? But the science of sleep ergonomics goes much further. This guide explores how spinal alignment, pressure distribution, body weight and sleeping position all interact with mattress design — and why the right mattress isn't the firmest one, but the one that responds correctly to your body.

Pregnancy can change the way you sleep. As your body changes and your bump grows, your usual sleeping position may become less comfortable, while pressure around the hips, shoulders and lower back can become more noticeable. Understanding how your sleeping position changes during pregnancy and how your pillows, mattress and sleep environment can support greater comfort can help you adapt as pregnancy progresses. Quick...

Sleeping on your stomach can feel comfortable and natural, but this position places different demands on your mattress. The areas of your body that carry more weight can interact with the sleep surface differently than they would when sleeping on your side or back. Finding the right balance of support, comfort and firmness can therefore make a significant difference to how a mattress feels....