It's not often that I travel someplace, and then dream about it for months afterwards. I dream frequently about the Sky Lagoon in Iceland, which I visited last December. In my dreams, I pause at the entrance to the geothermal lagoon, which is on a bluff overlooking the Atlantic Ocean. The front desk, in my dream, is carved out of stone. The hallway beyond, a rich alder wood. Should I choose a private changing room, to the right, or the communal changing area, to the left?