As long as the buyer does not skimp on the quality of the hidden trundle mattress, a trundle bed can be as comfortable as any other bed. Adults, however, still may not find classic design trundle beds to be comfortable for more than a few nights. The low height of a classic trundle bed design is an inconvenience, especially for older adults who struggle with weight or joint issues as the trundle bed is literally only one step up from sleeping on the floor. Also, climbing up and settling down without falling are a safety issue that will impact comfort. Newer options in trundle beds offer a "pop-up" feature that lifts the trundle bed to standard height and eliminates the problem.

On the Other: Sturdy construction for kids

On the other hand, younger people and children are not likely to be concerned about falling or creaky joints, so height is not an issue that will likely impact their comfort. If the mattress is good, they should be fine. Some parents should consider the sturdiness and construction of the bed before allowing little ones who are prone to jump on furniture bounce on a trundle. Also, remove sharp objects and furniture from around the edge of the bed to avoid someone tripping in the bedclothes and hurting themselves.

Bottom Line

A good quality mattress on a trundle bed ups the comfort and lessens the inconvenience, which makes a trundle bed a neat and compact way to add contingency sleeping space for extra people without requiring an extra bedroom. They are great for short stays and younger people. For adult guests, invest in a pop-up trundle. At the right height, guests may not be able to tell the difference between a trundle and a regular bed.

Source:

Trundle.com

Hubpages: Pop-up Trundle

Colorado State Extension: Safe Housing for the Elderly