It is completely normal.

I have not idea what passively assertive is but what you should do is learn when to be “alert” as you call it.

When I am at work I am ready to go. When I am at home I am zoned out and not dealing with it unless it is time to. When I am driving,I am ready to go. When I am chilling on the stairmaster I am in he zone and focused only on the next step.