We've slept in the SilverKris lounge a couple of times. Usually there are very few people there overnight, and you can stretch out on the couches. The staff have brought pillows and blankets for us. I would recommend having your earplugs with you, as it isn't particularly quiet, with vacuum cleaners and announcements. We found it quite comfortable, and managed a few hours sleep. The showers are very good, and there is usually no wait, or at least only a short wait.