It is an autistic thing to like being inside dark little spaces? I love being inside my wardrobe because it's tight, dark and silent (it absorbs most of the sounds of outside). My mom and the lady who takes care of my grandma thinks it's weird, but I can't help it. I put on my earphones, turn on the music, go inside de wardrobe and stay there, just chilling. I don't think it's weird, and I have been doing it since I was 4.