The tall ones in your family will appreciate this. These can also be ratcheted to different angles so they can be used as a head rest, or put all the way down for a totally flat surface. Another great feature that some of these have is a ratcheting back that lays down easily to convert it to a fully useable bed surface. No pullout mattresses to deal with on these, so you get a lighter and equally versatile piece of furniture.
Convertible sofas may not make the most Corduroy Modular Sofa comfortable beds in the world, and they may not actually be the best option if that is what you are looking for. They are not designed to be a Serta or Simmons, or to be used every night. However, most are acceptably comfortable for a sofa bed, and I have actually slept very comfortably on them before. Long gone are the days of the dreaded metal bar in the back from sofa beds from years gone by.
Speaking of comfort, please do yourself and your guests a favor and recognize that the materials used in covering convertible sofas make a huge difference in how they feel. Nobody likes trying to sleep on a surface that gets too hot during the night. Materials like vinyl tend to trap one’s body heat and moisture, and can be pretty lame to try to sleep on unless properly covered. Mattress covers or even a spare blanket under the bottom sheet can solve this problem.
Of course, opting for fabric or upholstered coverings are equally subject to problems like scratchy or rough textures. Again, the proper covering can solve most of these issues. The best thing to do is pay attention to these sorts of things when you are choosing the right sofa bed for you. A little diligence at the front end will pay off handsomely in the long run.