Quote:
Originally Posted by boytos
The difference is shoulder and arms are fully supported. It is not the case when sleeping flat.
(i guess)
When your are sitting, something that support back and shoulder fully is good, i think.
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Ive thought about cutting a full length memory foam topper just short of the width of the shoulders so that when one sleeps on it allows the shoulders to fall backwards thereby opening the thoracic outlet but who knows whether it would be comfortable. The problem with mattresses is that they tend to sink more where the body is relative to the shoulders and hence push the shoulders forwards and inwards which is exactly what you don't want