I dreamed that I was on a passenger train traveling somewhere overnight. It was night outside, and dim lighting in the train car. There were couches and ez boy chairs for everyone to lounge and sleep in instead of normal train chairs/benches. Most people were cuddled up in the chairs with blankets sleeping or watching the "in-flight" movie. I got up to change seats and as I was walking up and down the aisle, I realized I wasn't wearing any pants. Most people were in pajamas, but I was the only one just in my panties, and I got embarrassed.