Electro-shock. Keep a car battery and some jumper cables close to your gaming station. When weariness sets in, show it what 12.6 volts of direct current feels like.
But, if you have a pacemaker or some other heart condition, a mild sedative induced sleep period. This will ensure you waken rested and refreshed for a productive day of gaming.
If you're not smart enough to survive, you are basically just food for something smarter.