292 berth has a slope to it, I've slept on mine a few nights but wouldn't recommend it for more than the occasional overnight. You could try to fill the space between the couches, but I think would be more comfortable doing that with a 353. A friend has a 382 and says its fairly comfortable.

I spend a couple of nights on my 312 and it is not very comfortable. I'm selling it and will get a boat with bigger cabin