DRIVER HAD BACKED UP TO STOCK PILE AND WAS WAITING TO BE LOADED. HE HAD BEEN ASLEEP, WOKE UP AND TOLD A FELLOW DRIVER HE COULD NO SEE, & HE WAS NOT FEELING WELL. CO-WORKER SAID THAT HE WOULD GO & GET HELP BUT EE SAID NOT TO & THAT HE WOULD BE ALL RIGHT, WHEN EMS ARRIVED THEY PUT MONITOR ON EE & SAID HE WAS GONE.