Well a lot depends on what you are used to, as it isn't easy changing your position after several decades. There are a few things that you can do.
If you are a back sleeper then a firmer mattress is preferred as it will better support your spine posture. You also would want a slimmer pillow to support the curvature at your neck.
If you sleep on your side then a softer mattress may suit you better as it won't compress your shoulder when lying on it. Your pillow needs to be a bit higher to support the space around your shoulder and the side of your neck.
Now many people move a lot from side to side and their back. If you are in that boat then a curved foam pillow with a low and high side of the pillow can do both.
If you sleep on your front then it often means that you have your head to one side and arm up over your head which places your spine in a rotated posture and your shoulder in an awkward position. Its not an easy thing to change but one thing you can do is to try sleeping with a pillow underneath one chest when on your front. That way you are a little closer to be a side sleeper!
So the answer to sleeping position, pillows and mattress isn't a one size fits all matter. It depends on what you have gotten used to and what pain or discomfort you experience during the night and in the morning. Its about putting in place a strategy to improve your current sleep situation. Who would have thought there was so much to it?
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