Someone asked a question about the humor in a memoir. Is it odd that humor infiltrates a memoir about mental illness?

Hornbacher on the humor of mental illness:

“As I’m ramping up into mania I am aware of how batty I’m getting. You become your moods and thoughts. There’s no ability to step back from the immediacy,” so things appear to be funny.

“The reality is that mental illness is not always like that,” she says after reading a dramatic scene  about  gallivanting with a fellow mentally-ill friend.

“I’ve ridden these moods since I was a child.”