My auntie (now 87) is diagnosed as bipolar, although she hasn't had an episode in many years. Her manias and depressions dominated my childhood, as her loving sister (my Mum) dealt with her. But, I've thought for a while that she maybe has an autistic spectrum disorder too. On Christmas day, my Mum said something which added to that idea. I asked what my auntie had been like when she was younger and my Mum said she thought she was better than everyone else and distanced herself from others. I don't think my auntie does think this at all, but maybe the way in which she conducted herself gave others that impression, just like it does for many people with Aspergers.
My daughter and I have mood swings too, but nothing like my auntie. We can swing in minutes and it's usually related to what's going on in our lives. They are not extreme at all. I was depressed on Friday and cried for a few hours. Then I was right as rain by the end of the evening, had a joyous weekend and I'm just fine now. My auntie's manias or depressions would go on for months at a time and didn't seem linked to anything at all (but maybe she saw it differently). However, I really see the connection with my situation and my daughter. The autistic traits can be traced via my Mum, to her Mum (who had depression, similar to my auntie) to her Dad (whom I never met, but from my Mum's description, he sounds pretty Aspie to me).
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"We act as though comfort and luxury were the chief requirements of life, when all we need to make us really happy is something to be enthusiatic about." Charles Kingsley