Even in this situation, if your wife is in fact
niddah, you should not sleep on the
same bed.
Perhaps you could arrange to have a cot brought into the room, explaining that the sleeper sofa is not comfortable for two? (Often a hotel room has a chair that opens up in addition to a sleeper sofa.) Or one of you could sleep on the closed sofa and one of you on an air mattress on the floor.
We hope this helps you think of an idea.
