OT I wonder whether obesity, which is implicated in airway collapse and hence SA, might also make sleeping on one's side uncomfortable, because of the weight borne by one shoulder or the other. There are probably a fair number of people who are thin but just don't like sleeping on their backs, and they might benefit from the tennis-ball idea, but if your weight makes sleeping on your side painful, then putting tennis balls on your back now gives you 2 choices of how to have a lousy night's sleep.
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