No doubt the first 4 hours are intense and draining, which I definitely experience. But curious if any on this thread notice any correlation with what you put into your body? If I heavily caffeinate, I'll usually want to collapse right after work, which isn't helpful since I really would rather spend at least some time on personal projects each night (personal preference, not prescribing or judging to those that don't). Also, a bigger/carbohydrate heavy lunch usually knocks me out whereas something lighter or more fat+protein based won't as much.

[edit, cleared up who this is targeted at]