Re: Sleeping preference?
Got those snap together plastic pseudo springs at last Annapolis show. Work great. Wife's hands would go numb and her shoulders would bug her. No issue since putting them in. Also get some air under the mattress.
We sleep in the forward queen if not moving. Out of traffic flow so one can be up early and do their thing without waking the other.
Underway like sleeping in the quarter berth. If it not really nasty crack one of the ports facing inboard below the cockpits seats. Between that and the repeater of the nav display on the iPad know what's going on without getting up.
Wife likes sleeping in forward queen if going downwind . Everyone likes sleeping aft of the mast going upwind.
Try to never make people hot bunk. Gives them a sense of having their own space.