Sometimes what we feel as exhaustion is more the emotional catharis we achieve. Also crying is a non-violent means of discharging distress (in itself a physically tiring process),and (sometimes unknowingly) the distress of previous associated experiences. Psychologically we can as a result make clearer sense of issues, present and past, and that too can leave us tired although hopefully sometimes wiser; but it's a learning process which consumes effort.
Also puzzling is why men who would appear to be adults think that behaving like children is somehow intellectually smart and hugely amusing. But that's a whole other can of worms
Caryl