In Feng Shui, can someone else's bed be used for sleeping?

I don't know Feng Shui, but I try not to use a second-hand bed in reality. For example, many people lie in bed when they smell sweat (very tired), often go to bed without taking a shower for two or three days, and don't often clean the bed (probably because of busy work). I'm afraid of this kind of second-hand bed, so I suggest not sleeping in other people's used rooms as much as possible.