I've found back-to-back, full contact, sleeping on the side to be good for either (1) a small bed or (2) a crappy mattress. For the arms: put the "lower" arm bicep out, elbow at 90 degrees, forearm up next to the pillow. "Upper" arm can pretty much go anywhere.
Perhaps that's obvious to most people, but I made it to 33 years old before figuring out a good arm position.
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I can't read your signature. Sorry.
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