Research the vast number of articles relating to sleep deprivation. If you're getting less than 7.5 hours every night, sleep deprivation is a likely cause of your tiredness. Changing lifelong habits is uncomfortable, but can be accomplished with amazing results.
Cooling the quench water does not reduce the deheading vapor cloud and "hot spot eruptions". Quench water evaporates in the closed coke drum and is typically condensed/cooled in a closed blowdown quench tower system. Quench water supply temperatures range from 140-160F, thus your 120F...