I'm old and from experience, I'd say it's most probably a string of short nights that are starting to catch up with you. That's when I start getting "mental vap

I'm old and from experience, I'd say it's most probably a string of short nights that are starting to catch up with you. That's when I start getting "mental vapour lock." Regularity is _very_ a good thing when it's diet, sleep, and bowel movements. 5 classes is more than full-time, yes? And adding in that part-time job and life, you aren't leaving much down time. If you keep trying to use every hour of the day without first allotting your sleep/downtime, your situation will only get worse. Robert Heinlein has a quote, "Always budget the luxuries first." Paraphrasing makes this apply to you: "Always budget the downtime first." What you have left after that 9-10 hours (yeah, take the time. You need to shower and eat in peace, too) is what you can use for everything else. Don't think that because you're pursuing a four year degree that you must complete it in four calendar years. Consider what's better for your future, a degree finished according to the calendar with okay marks, or an extra year to finish with pretty good marks? You're young and you really do have the time.