I have always slept on a full size bed. As in always-from crib to full size. And even as an adult when I bought a new bed a couple of years ago, I bought a full because it fit into my apt. Now I am sleeping in a twin, and the first night was scary, because I kept thinking I was going to fall out of it. My dad slept in a twin until he got married, so I know it's possible, and this bed is very nice. It's supportive, etc. Last night was much better, and I have been waking up less and less.