I stayed up 54 hours once, I never really drink pop or anything with caffeine so I have no tolerance. I was on a mission trip for a few days helping in WV. So on the last day all of us stay up really late and never really sleep. So we chugged a few vaults and shotgunned some. That night I tried to sleep at like 5 but couldn't so the next day home I still couldn't sleep(I don't sleep well in cars so yea) So I get home and can't sleep then finally the day after I crashed around noon and slept for 13 hours. So just drink enegry drink after energy drink but be ready for a crash.