Last week I played in a $100k guarantee tournament. It started late day and was 2 flights. On the first flight I crashed and burned when I lost all energy and just couldn’t think straight; while I did make it to the 2nd day I was short stacked and I think I played poorly.
The reason I am writing today is because I experience the same thing after about a long poker session… My brain just seemed to stop working.
Moral of the story – don’t overdo it. Take breaks. Make notes. And eat something before it’s too late.