Sleeping three to a bed
Ok, silly question, but I'd seriously welcome input from more experienced polyamorists: how do you deal with sleeping three to a bed? I mean actually sleeping, in the non-euphemistic sense. Very limited experience suggests that it's just not all that comfortable for the one in the middle, especially if he or she is at that age where getting up during the night is non-optional.
Background: newly-formed poly triad involving very-long-term married couple and single woman, none of whom have any poly experience, and none of whom was particularly looking for a poly relationship when we met. Strong emotional bonds all around, no jealousy at all at the moment, major NRE. We have no idea what we're doing here; we just discovered that we all want to be with each other all the time and we're taking it from there. Any advice at all from the more experienced would be welcome, whether or not it involves beds.