Memory foam mattress myths debunked — 4 things I’ve learned about all foam beds after testing them from head-to-toe

A collage of images showing the memory foam mattress testing process in our sleep lab. Top left, we test thermal imaging by using a phone with a thermal imaging camera, looking down on the mattress on which a member of our testing team lies. Top right, we test motion isolation, as one tester lies on the left side of the bed and the other jumps onto the right side. Bottom left, another motion isolation test, as two testers stand on the right side of the mattress using a tape measure and rig to determine where to drop the slam ball. Bottom right, we test pressure relief using a laser pen, trained on our testers back as she lies in side sleeping position.

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Yes, I think there's an all-foam bed for almost everyone. Find our top picks in our guide to the best memory foam mattresses.

Memory foam mattresses are often though of as soft, squishy, warm — a bit like a marshmallow halfway to becoming a s'more. And that gooey coziness comes with a reputation for certain downsides.