There's no need for a guest room when you have a sofa bed. Shop these under $500 from Wayfair, Urban Outfitters, Amazon and ...

The standard sizes are single, double and king ... this Osaka corner sofa bed can be built to your preferences, depending on the size and style of the room it'll be living in.

The issue is that not everyone has the floor space to install a full-sized version that pings into a double bed. Luckily, single sofa beds, or bed chairs, are a thing and make ordinary seating ...