My Brain is Officially Fried

Dammit! I was doing so well!
But the past few weeks, I've noticed that when I leave the house and try to have a real conversation, I act like a total idiot.
I AM SO TIRED.

Scenario 1: I run into woman from baby yoga at a park.
Her: "Hey! Are you still doing the baby yoga class?"
Me: (blank stare.)
(I know the answer. It's 'no,' but I was thinking about how the baby yoga class is useless once you know all the moves because then it feels like it goes too slowly and plus it's baby yoga and massage, and I don't want to do the massage, and... etc. But all I could do was stare at her as no words came to me.)

Scenario 2: talking to favorite salesperson at Giggle of Greenwich.
Laura: "How's the baby?"
Me: "Good!" (I look at her. Loooooooong pause as she waits for details. I can't think of anything interesting to say.) "Um. Wow. I just realized that I'm really tired."

I think of myself as a really good conversationalist, so it's sad to see myself failing miserably but be too wiped out to do anything about it.

I mean, obviously the baby is worth the brain-fry, but this makes me wonder how I'm going to do my teaching job when I go back in January. I think I need to give the baby a full feed, rather than a half feed, when he wakes up at night. I keep thinking, "Oh, he's supposed to be able to sleep through the night, so he doesn't really need this food (breastmilk), so I can just give him one side and maybe he'll go 3-4 more hours before he wakes again." But noooo he'll wake after 1 or 2 hours, and it's killing me. I just have a feeling that he needs the calories, because he is not crazy about solid food. He likes hummus, but those baby fruit and veggie purees, he could take them or leave them. Maybe I should puree some of the turkey chili I'm making today? Kidding, kidding!