Fatigue makes a person do things they wouldn't expect to be able to do.
Like just now. I set the alarm on my cell phone to go off in 30 minutes (it's on vibrate, so it wouldn't disturb everyone within earshot), put my head down on my desk, and fell sound asleep. Which I desperately needed to do, obviously, or I wouldn't have been able to sleep. But so help me, when the phone alarm woke me up, I was in the middle of a dream. That's how worn-out I am lately, and I *know* it's from stress.
I hope this interview is successful. That'll resolve a LOT of issues, starting with the stress of not knowing what's going to happen next with this assignment.