Anxiety
Insomnia (Even if you still feel tired.)
Restlessness
Inability to Focus
Disorganized Thoughts
Panic Attacks

These symptoms are "less common" because they are more difficult to distinguish from depression and anxiety (as they are extremely unpleasant.) However, they all involve a sort of activation.

My psychiatrist helped me make sense of my bipolar 2 diagnosis by explaining that it is better understood as major fluctuations in energy. For me, my periods of increased energy are defined by what I wrote above. No optimism, unfortunately.