I get daily pregnancy e-updated from whattoexpect.com, and I am pretty sure one of the more recent ones said that your brain tends to shrink during 3rd trimester (it's supposed to go back to normal after delivery). Or something like that (case in point).
And coincidentally, final exams are approaching. Luckily, everything is open-book this semester. Especially physiology and biostatistics. Otherwise, I might have been turning in mush. Kind of like my brain.