In effort to not clog up a different thread, it’s poll time. For left and right, think your left and right if you’re lying on your back in bed. Can choose 2 options. If no current bed partner, go with past ones.
We switch every few months on no schedule and for no reason. Somebody is occasionally asleep on the opposite side of the bed and the other person deals with it and sometimes it sticks. Currently am further from the door, not long ago was closer.
I sleep on the left since I sleep on my side and this eliminates jamming my knee into the SO by accident. Not so much an issue at home now with a king bed, but translates over nicely if we ever go someplace smaller.
In our current house, the left/right choice makes her closer to the door, I don’t remember which side was closer to the door in prior houses, but she’s consistently been on the left, and also takes the left when traveling.
We have changed it up, and also moved our bed. So sometimes I’m on the left, sometimes the right, sometimes closest to the door, sometimes farther.
In a hotel, though, I always pick the bed farthest from the door and the side farthest from the door, unless I’m alone, then it’s bed farthest from door and side closest to tv remote/nightstand.