That makes understanding easier. For me, it was this.
I guess I'm an introvert, which makes a ton of sense. I like being around people, but not constantly. I've had situations in the past where people were here and I started thinking "okay, you can go home now", all the while smiling and being a good hostess. (Fortunately, we ended up not hosting meals because Brian started worrying about how company affects the kitties.)
The Disney meets would be so intensive for me, with all the preparation and being at the parks as long as others in our group were there, well, when we got home there were times I didn't want to leave the house or talk to anyone for at least a month afterwards. I was beat. Seriously drained.
I know why I'm so tired the day after a movie. If we went to the movie and walked right in and sat right down, it probably wouldn't be so bad, but we stand in line for over an hour, making small talk with the people around us.
My mom was an extrovert. And she could suck the life out of anything. She was like a little hummingbird, not being able to sit still, always having the conversation moving, no such thing as a comfortable silence (it was like that growing up with her). She needed a lot of energy.
And having Brian working out of the house now...not much "me" time. No wonder I'm always tired......