What Is The Best Room Temperature For Baby?

Hi mummies, I have a 1mth+ baby currently co-sleeping with me and my husband. Recently we noticed at night she doesn't like to sleep inside our bedroom. Whenever we put her on the bed she will fuss around and when we bring her out to living room she will sleep very soundly. I'm wondering is it because of the room environment or is because of the temperature? My room air-conditioned temperature is at 23deg cel. Thanks