(This mattress size is also a bit more common among the sub 30-year-old crowd, according to one small survey.) Best for: Only 3% of Americans sleep on a twin XL, most of whom are in the 18- to 29 ...

From smallest to largest, they are: Twin size mattress Twin XL size mattress Full size mattress Queen size mattress Quick Tip: Split mattresses are ideal for couples with different bedding ...