The claim is mostly true, supported by research on the psychological benefits of holiday movies, though happiness is subjective and may vary among individuals. The claim is backed by research from Fielding Graduate University, where a professor of physiology explains that holiday movies can positively affect mental health. According to the study: Mood Enhancement is a factor since Holiday movies boost mood and relieve symptoms of depression by providing a comforting escape from daily stressors, along with Physiological Benefits, watching these movies can reduce cortisol levels, the stress hormone, benefiting cardiovascular and immune health. Nostalgia is a significant factor. Holiday movies often remind people of joyful memories from childhood, reinforcing feelings of warmth and connection. This emotional connection can be especially prominent during the period between Halloween and Christmas when people begin decorating and preparing for the festive season. While Thanksgiving is an important holiday, it doesn't involve as much prolonged celebration or symbolic media as Christmas. For many, the lead-up to Christmas starts in early November, and watching holiday movies can serve as an early way to get into the festive spirit. I understand that not everyone may feel happier watching Christmas movies before Thanksgiving, as some people strongly associate them with the post-Thanksgiving time. Cultural and personal preferences influence how people perceive the overlap of holiday celebrations. Overall, the claim that watching Christmas movies before Thanksgiving makes people happier is supported by psychological research and societal trends. While individual reactions vary, the nostalgia and physiological benefits tied to holiday movies make them a source of joy for many, even before Thanksgiving.