My girls like most Greyhounds sleep an average of 16 hours a day.
In my living room they have two huge rigid dog beds, with two slightly smaller rigid dog beds in the bedroom. All the beds have memory foam pads. Said pads have cool cotton covers in the warmer months and soft warm covers in the colder months, with even a nice fleece blanket thrown in. When really cold SnuggleSafes (look like thick Frisbees, but you warm them up in the microwave and they stay warm till the morning) are also put into the beds at night.
In my living room there is also a single thick duvet folded and put into a zip cover, which both girls take turns at using it.
They must be getting enough beauty sleep, as I think they are beautiful , but I may be biased:) LOL