This Is A Must Read
KNOWING WHEN TO SAY ENOUGH
This is something you should be able to recognize from the first sign of you yawning . There's been day's i've play'ed 7/8 hrs str , just because I was on an hot street. However the question we should ask ourselve's, What is playing too much poker . Playing too much poker is when you've been up so long that you begin to see patterns in the cards (or you think you do at least) . Playing too much poker is when you aren't living a healthy life, you aren't doing anything but playing cards. Playing too much poker is when you are taking time away from your friends and family to get in another game. Playing too much poker is when you haven't taken a couple days off in months (have you been there). To play well you need your rest and spend your time away from the table. I've found that my emotions are way harder to control if I'm playing too often. I need a break after a couple long days. Just listen to your body and if anything, play less instead of more . You'll be sharper and probably win more tourney's in the long run .
P.S. Apply this theory to your game, an watch how thing's work out for you.