ADD and laziness

Does ADD has anything to do with being lazy and sleepy all the time? My fiance has difficulty getting up early and sleeping at an early hour. He always finds it hard to be on time for work. Im so scared that this will cause him problems at work and i know that the ADD affects his performance. How can i help him without beating him down or making him feel bad about himself? Is this laziness due to ADD or is it something personal that is only due to plain laziness???