他说是疲劳导致他犯了那个错误。

He said that it was ___tiredness that led him to make the mistake.

我突然被一阵疲劳袭来。

I was overtaken by a sudden wave of ___tiredness.

我感到如此放松，我的疲劳几乎完全消失了。

I felt so relaxed and my ___tiredness disappeared almost entirely.