Question about a strange feeling I had?

The other day I was sitting in cl looking at pictures in a magazine and this girl in my cl sits down next to me and starts looking too. Then this really weird sensation came over me. My whole body felt soft. my neck, my eyes got really heavy. Its as if I had been pumped with some drug or something, I felt sedated. it was somehow related to her sitting right there next to me. Its as if I could feel the anticipation of her touching me. The moment she left the feeling immediately went away. Anybody know what this was?