I think this is a serious case of therapeutic overreach. I realize it's not about me but it frankly p*sses me right off that your T said that. (Caveat: If you've been telling her that your sleep is terrible or that your partner/spouse hates the light, it's reasonable to suggest a trial of no nightlight.) I don't think it's appropriate for therapists to express their opinions about the minutiae of our lives. In general I think therapists should be very, very judicious in expressing their opinions. It a very short leap from opinion to judgment. Also, does she moonlight as an interior decorator or something?