What can use as a bed?

Hay lounge, I live alone in a 1 room apartment. Right now Im using an enflatable air bed to sleep on but its hueg like xbox and I want  it so that theres more space in my room. (i dont deflate it)

So what can I get as an alternative for a bed that is small enough to fit in my tiny room? It has to be comfortable, and easy to clean, and if possible something that you could put away when your done sleeping on it. I can spend about 100$ max. Any suggestions?

if you already have a sofa then you probably don't want another one (unless you wanna sell your sofa) but how about a sofa bed? you can use it during the day, and pull it out into a decent sized bed at night