When I was single and lived in the apartment by myself, I would sing in the shower every day! But now hubby probably wouldn't appreciate it if i sang in the shower - he doesn't have to get up as early as I do and likes to sleep in while I go about my morning routine.
Singing in the car - all the time! But not in the am, because of the stupid morning talk shows. I hate them! I don't listen to the radio to hear people talk, I listen to hear music! But that's a whole other story, I guess.