I mean I'm not saying that I do not feel exhausted after playing
Matches where e.g we lose early game and have to come back somehow by avoiding commiting mistakes hard and somehow catching off somebody from enemy team could be exhausting cuz you're basically balacing on the edge for 30min :P
e.g after recalling/killing enemies/dying you have like 30sec to look around map and think what you as team want to do / achieve and how to do that
It depends on the stage of the game, but generally when enemies are around, then you may don't have time to think.