stopping when ahead?

[The_Dealor]

i have a similar issue lately. i play well for the first 100 hands or so. usually double or triple my buy in. then from ther on its just downhill. and its all usually on one stupid hand where i have a kind of blow up. i tell myself every time i wont do it again and that i will stay focused but i never do!

is there any way to just get some discipline overnight? lol.