Laughing in the back Seat with My sister

"My sister and I were in the back seat of a car, except we were kids, or I think we were, and she kept cracking up at something out the window. I leaned over to look and couldn't find whatever it was, just trees going by, but her laugh was so contagious I started laughing too without knowing why. The car turned into her old bedroom somehow, posters everywhere, and we were sitting on her floor sharing a bag of something, chips maybe, talking over each other the way we always did. I don't remember a single word we said, just that easy feeling, like nothing was ever going to be complicated between us. She grabbed my hand at one point and pulled me toward a door, so excited about whatever was behind it, but the dream ended before it opened. woke up smiling, wanting to text her."