Pull an All-Nighter or Sleep for Final Exam?

Ok so i have a final exam tomorrow because i didn't attend the original final exam date so the school set up a date for me to come and take my exam then leave since it'll be Saturday, , it's tomorrow and my sleeping schedule has been really off, like i woke up at 4PM today. Where i live it's currently 1 or 2 AM i think. and I should be in school at 7:30 AM the exam ends at, ends at 9 AM. i didn't finish studying the subject, which i know is a huge mistake and it'll take me an hour or so till i finish studying. By then it'll be 3 AM? The school is 5 mins away from my house (by car) and i can probably pull an all-nigher since i woke up at 4 PM, if i did that means i will be awake for 17/18 hours. So should i sleep for 3/4 hours or should i just stay awake? I mean 17/18 hours isnt that bad.