You need to take a break and let your brain recoup to be more productive. Watch a movie and hog down huge bags of popcorn and a 10kg bar of chocolate. I know

You need to take a break and let your brain recoup to be more productive. Watch a movie and hog down huge bags of popcorn and a 10kg bar of chocolate. I know people will say running/swimming, but that is good for when you are stressed. Not when you are almost burnt out. You are mentally fatigued and you need to do something that doesn't involve too much brain power while still being interesting enough - movie with indulging in movie food would work.