The wrong side of the bed?

I have noticed an interesting phenomenon lately. I have been sleeping on the left side of my bed instead of the right side. I can’t place quite how long this has been going on, but it’s definitely been happening with increasing regularity. This is unusual because, for the 8 years that Tawnya and I lived together, I always slept on the right side. And in the years since, I have continued to sleep more or less on the right side (or in the middle where I can spread out). But in recent weeks, I’ve noticed this trend of sleeping on the left side. I notice no difference in the quality of my sleep. It is strictly positional. But I can’t explain it and it bothers me when I can’t explain things.