there's a difference between 'lavender scent' and lavender essential oil. Be sure to get lavender essential oil for this, not jsut synthetic scented stuff.
I bet Whole Foods or Sprouts would have it.

when I was young I always envied the soldiers in the subway to be able to sleep wherever they can (like pull the tray from the front seat down, lay their forehead on it and zonk out).
now that I have kids I think I could do it too -just catch some sleep at a moments notice but be alert in a second (just in case they are burning the house down)