Personal experience / opinion: For me sleeping positions are an issue of expanded (back) or contracted (side) body language.
In an expanded state I seem to have a lower threshold for cognitive dissonance. I.e. my mind is less prone to indulging in pleasant-but-at-odds-with-reality thought trains. So I, for mental health reasons, try to fall asleep on my back when I can manage to tolerate the expanded state.
Personal experience / opinion: For me sleeping positions are an issue of expanded (back) or contracted (side) body language.
In an expanded state I seem to have a lower threshold for cognitive dissonance. I.e. my mind is less prone to indulging in pleasant-but-at-odds-with-reality thought trains. So I, for mental health reasons, try to fall asleep on my back when I can manage to tolerate the expanded state.