A daybed = sofa bed is typically is a sofa which has underneath its seating cushions a metal frame and thin mattress that can be unfolded or opened up to make a bed. Not to mistake a sofa bed for a futon this one differs from a sofa bed, although sofa beds using futon mattresses are common. You can find out more about daybeds (sofa beds) at this link.
How are these daybeds so advantageous in a home? This type of furniture is very nice to have especially for a small apartment due to its size. This wonderful piece of furniture works well as a bed and a sofa (usually three person couches). It's superb being able to find a way to sit down during the day and then turn it into a bed at night. Now do you want a piece of furniture that's quite versatile too!
There are many different styles, sizes and colours. Sofa bed's come in leather, microfiber or fabrics and it's frame can be made out of strong solid wood or metal. It can be quite expensive but also inexpensive. But for sure you won't have to spend anywhere near as much money for a sofa bed than a king-size bed and a couch together.