Visit local furniture stores so you can browse their selection of sofa beds. Stores like Jennifer Convertibles specialize in couches that convert into beds. If you have a specialty furniture store in your city or town, make sure to browse its selection. Visit the link in the resource section of this article for examples of popular sofa bed retailers.
Sit on each sofa bed and compare the comfort of the furniture as seating. Note the ease of sitting and rising from the sofa. You shouldn't have to strain to pull yourself up from a comfortable sofa bed.
Pay close attention to the fabric of the sofa bed. Rub your hand against it to make sure it isn't scratchy or otherwise abrasive.
Ask a sales associate to open the mattress so you can test that as well. Try sitting and lying on each bed. Make sure that you cannot feel any springs or bars as you lie there. Roll to your side so you can get an idea of what it might actually feel like to sleep on the bed.
Pull the mattress out by yourself and put it back in to gauge the ease or difficulty of these operations. A comfortable sofa bed loses appeal if it is cumbersome to open up or close.
Measure the mattress to ensure it is long enough for taller house guests, yet still fits within the dimensions of the room that will accommodate it.
Investigate the thickness of the mattress. Sleepers tend to have thinner mattresses so they will fit compactly into the sofa. When you use the sofa bed for sleeping, you don't want to compromise on comfort.
Select the sofa bed that provides satisfactory comfort for both sleeping and sitting. You'll provide a good night's rest to overnight guests, while saving space and enjoying comfy seating during the day.