I am diagnosed with Aspergers, but also suspect ADHD. This is how it goes for me:
I seek out novelty and stimulation (ADHD), and then when I have it, I can't handle it (ASD), so stop and spend a while calming down. Then I get bored and the same cycle happens over and over again. I also often also decided to do things on impulse, and then couldn't handle the result. In practical terms, this means:
I really want to try that new dish at the restaurant, sounds yummy, but once in the restaurant I can't stand the loud music or there are people smoking, so I have to leave.
I really want to visit the museum because it sounds really interesting, I want to go out, got to get out of the house, but when I get out, I hate the traffic, there are kids shouting and screaming, I can't concentrate, etc.
I seek out novelty and stimulation (ADHD), and then when I have it, I can't handle it (ASD), so stop and spend a while calming down. Then I get bored and the same cycle happens over and over again. I also often also decided to do things on impulse, and then couldn't handle the result. In practical terms, this means:
I really want to try that new dish at the restaurant, sounds yummy, but once in the restaurant I can't stand the loud music or there are people smoking, so I have to leave.
I really want to visit the museum because it sounds really interesting, I want to go out, got to get out of the house, but when I get out, I hate the traffic, there are kids shouting and screaming, I can't concentrate, etc.