Hi Marc I have a question about intensity.

Long time viewer first time question asker lol, I've recently been upping the intensity of my workouts as opposed to doing more of a powerlifting style training with linger rest periods as I have a higher metabolism. I've been doing this for 3 months and ever since I get very very very tired after training. On some days I work late so I work out in the am before work and my job is rather cerebral so I can't be almost falling asleep. Is there a way to reduce this so I can keep the intensity high? I'm 5'11 and 160 pounds my post workout is 20oz whole milk 10oz OJ and 2 scoops of core pwo.