I graduated from high school in 2008 and college in 2012, but I still have a recurring nightmare where I find out that there's a class I'm supposed to be in but

I graduated from high school in 2008 and college in 2012, but I still have a recurring nightmare where I find out that there's a class I'm supposed to be in but somehow forgot about and now must somehow redeem my grade despite having not shown up for any lectures or done any homework.