I am merely a resident, and can only tell you that private practice Neurology seems to have a great deal of individual flexibility.
At my hospital, the hours for Sleep, EEG, and EMG are all light. There isn't a specific Alzheimer's, or Cognitive/Behavioral rotation at my program...but there are a couple of residents interested in those subjects here and I've heard very similar hours to the three mentioned above for them.
I think there are people on these boards that can give your question a better answer than me with regards to private practice.
Best wishes.