Something I just realized, is that traditions usually start without meaning to. Like when my best friend lived far (but even farther now) when she visited, me, her, and our other best friend would end up sleeping in the same room. Two in the bed, one on the floor. My husband even realized this and would sleep on the couch when the three of us were together. We never said anything aloud, but it's like our time was too precious to even say "goodnight" & sleep elsewhere. And thus it went for years.