Rocking while driving

Every time I go to work I ride with my brother in law because we work for the same company and the same hours and I do not drive on the freeway yet it still scares me. When we were in the car today I was sleepy so he put rock music on the radio and he was rocking while driving and while trying to talk to me. He said that the singer of the band went to drug rehab before but I really never pay attention that much because I was so sleepy and I can hardly open my eyes. Imagine I only had two hours sleep last night so all I wanted is to get home and take a nap.