I'm not an expert.
Plants can be a breeding ground for mold.
I understand that at one time, some hospitals would take flowers out of a room when there were many of them, for plants absorb oxygen at night. Photosynthesis only works in sunlight. Indoor plants generally improve air quality. I can't think of any reason other than specific individual allergies, that might occur in some people, not to have them in a bedroom. Argonne National Laboratory, Division of Educational Programs, Harold Myron, Ph.D., Division Director.