I probably did the exact opposite of most people, but I did what I always have done and what works for me. I had studied for 3-4 months before. Got a hotel room by the test site the day before. Continued to look over stuff and be familiar with the CERM and my other references. Did a few practice problems, went to dinner, came back, looked over practice exams and ran a few 6 minute solution problems up until it was time for bed. Made some tea (chamomile, part of my normal routine), laid down, passed out.
Woke up in the morning and got there as the doors were opening, as someone above mentioned there was so much time between when doors opened and the exam room was opened. I sat, calmly reflected on everything, and mentally prepared before going into the room. Didn't eat breakfast, just drank some water because I rarely eat breakfast.
My point is, do what you know works for you. If you are like me and have always crammed before exams on top of studying for them in a regular manner, don't eat breakfast, whatever it may be, then that is what you should do for this. Don't change your past study habits/test taking habits because people on here suggest a different method.
I do agree with everyone on here that it is important to get a good nights sleep regardless of your past habits and make sure you are familiar with the test site and where to go.
In regards to taking the exam, again, I operate differently and just go from A-Z. The first problem on October 2018 made me scratch my head and think of impending doom and how I am not fit to be an engineer but I just sat through and figured it out as much as I thought was correct. There was only one problem that I spent 2-3 minutes on and then decided to skip, circle, and come back to after my first go through.
Again, I think everyone has different strategies to exam prep and test taking. Do what you know and what has always worked for you.
It worked for me first try and thankfully that wretched test is behind me now and I have the coveted, post-nominal letters, P.E. as of a few weeks ago.
Good luck to all test takers this go round, you got this!