Sofa beds have several advantages, including:

They save space by allowing you to use one piece of furniture for both seating and sleeping.
They are versatile and can be used in a variety of settings such as homes, apartments, and dorm rooms.
They are convenient for overnight guests, as they provide an extra bed without taking up extra space.
Many sofa beds are designed with comfortable and supportive cushions for both seating and sleeping.
They are available in a wide range of styles, sizes, and price points, making them suitable for a variety of budgets and design preferences.
In terms of sofa beds, stretching it means to fully extend the sofa bed from its couch position to its bed position. This is usually done by pulling out the bed frame from inside the couch and unfolding it to create a flat sleeping surface. It is important to note that not all sofa beds have the ability to stretch or extend fully, some may only have a recliner position.

In general stretching means to extend or elongate a material or muscle to its limit, It can also be used as a verb for physical exercise, yoga or warm-up to stretch your body.