Sorry for not being clear, I mean energetic after the workout and sharper with the exception of when I make a workout more brutal.
Might also be a case of not knowing when to pick and choose your battles.
After lower body workouts I always like to go for a 30-60 minute walk and I think it helps a lot.
There all things to think about.
Do you have a log? If so, you might want to start logging how you feel before, during, and after the workouts to see if you can spot a pattern. I would definitely start doing something for conditioning (whether it's shorter rest between sets or complexes, sled work, hill sprints; maybe even just regular walking can do the trick)
Could be overreaching/overtraining. How long since you last took time off or deloaded? Also do you consistently train to failure and incorporate alot of intensity techniques? negatives, forced reps etc.
Cold intolerance,fatigue,lethargy,slow cerebration with poor memory maybe subclinical hypothyroidism due to hyponatremia from peeing out every hour with ++ water in-take at the work out. Not a diagnosis just a question, I would go see the GP.
Good point, historically I haven't been great at choosing my battles. Each workout I aim to hit predefined numbers and I don't easily back down. I'll definitely be cognizant of these patterns in the future.
Good call on the logging. I do log workouts, but only numbers.
Yeah, it helps in that I don't have to deal with the intense mental exhaustion for long before sleeping. But I feel most energetic in the morning and usually feel sluggish by evening, which tends to affect my lifts. This may end up being the best 'fix' if all else fails.