1. Soft Lighting
Ambient or soft lighting is a way to achieve a warm feeling in the room. Twinkle lights can be used to frame the back of a bed or around the ceiling of the room, they also come in warm white or multicolor LEDs. Another way is by using candles, they provide warmth and a good smell to the room. For the Christmas time, using festive scents would be fitting. Some common scents would be cinnamon, pine, and vanilla. Lastly, would be lamps, having lamps on can provide more light than twinkle lights and candles.
Link to twinkle lights
2. Blankets
Having blankets on the bed can give the room a comfortable feel and make it more inviting. This will make you want to stay in your warm cozy bed for hours watching so many movies.
Link to blankets
3. Christmas Decorations
To make you feel the Christmas magic, everyone needs to at least put a little Christmas tree in their room. Many people will have a garland above their bed for the holidays. Other things people have put in their rooms are little knick-knacks like nutcrackers or a cute Christmas sign.
Link to decorations
4. Add Festive Scents
Having in your room something that smells warm and sweet with give the feeling of Christmas time. Burning candles is a great way. But there are other ways too that you could get the sent in your room. One way is to buy using a wall plug-in. They will produce a scent into the room and you can change them to be whatever you want. Another idea would be to buy the cinnamon brooms and keep them in your room. Those only come in one scent and can be very strong.
Link to candles
5. Play Music
Lastly, playing holiday music when you are not watching Christmas movies will bring your room a cozy feeling to it and feel very warm and inviting. You can play these on a record player, TV, or Amazon Alexa if you have one.