Yes, it's no problem. We used bed rails at the Poly this last summer. We used it on the fold down Murphy bed though. Not sure about the sofa bed, but I think it should work. Just call housekeeping to request it. Good luck!
It may depend on the style of sleeper sofa. Some don't have hard bottoms and are stretched fabric that the mattress is on. They won't work on those. You can also buy a pool noodle or two, put them under the bottom sheet on the bed near the edge of the bed. Makes a nice little ridge that the child cannot roll over.
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