Can I use a red wall for the bedside background?

No, the room is quiet. It's a place to rest. Blue is quieter, beige is warmer, and red will make people fidget and affect their rest. Feng Shui comes from the science of life, and anything that is inhuman certainly does not conform to Feng Shui. The TV background wall is not good either. When watching TV, I will look at this red wall and stimulate my eyes. Watching TV will also be affected, which is definitely not in line with Feng Shui.