For me it’s whenever I’m feeling over-booked. Too much responsibility, too little brainpower, and I feel like I’m letting something slide in order to keep my head above water. (I tend to be a little anxious and overworried about my performance at work and school anyway.) They tend to show up right around Thanksgiving and again around the end of April, coinciding with my class finals. Once I’m done with my degree, I have no idea when I’ll get them - probably somewhere around the end of the fiscal year at work, or perhaps right around my annual reviews? I’m sure I’ll keep having them - they’re pretty standard by now.
I’ve had so many variations it’s not funny:
I’ve somehow missed a credit or course area, and have to re-take the whole thing now. Today’s the first day of class, required attendance, and I’m on an unfamiliar campus/high school, and I don’t know the course number/professor/teacher/room number/campus building or I can’t find anyone available to ask.
I’ve managed to skip class the entire semester, and the final is today, and I don’t know where my classroom is.
I’m trying to get to school/class/work, and am constantly delayed by parades or traffic or road construction or my car won’t drive properly (in the most recent one it only drove in reverse, so I looked over my shoulder and just drove in reverse until I found myself walking).
I’m IN class, and come to myself realizing I have no fucking clue what this class is, where the hell I am, and I have an exam sheet laying front of me, and am surrounded by other students working busily. This one is actually kind of funny, as I am quite good at BSing, and usually I shrug and start making shit up while I frantically scramble to remember what the class subject was.
They’re not exactly nightmares - I rarely have true nightmares any more and when I do, they make this sort of thing look like happy relaxing sweet dreams. But these ones are memorable and frustrating, and I usually wake up from them thinking “Ok, I need a massage, stat, and I’m taking a mental health day from work this week.”