It seems like he was on his way to be on duty in a 737 [0], so if he wanted to crash a plane, he'd probably been more successful a couple hours later.

But who knows, people have episodes. It sounded to me like they had a fight, but no details so pure speculation.

0. https://abcnews.go.com/US/alaska-airlines-flight-diverted-af...

Somewhere buried in the reporting he had said he thought he was asleep and wanted to wake up.

He had been up for 40 hours without sleep at that point, so he was definitely messed up.

Too soon to know. Could be another undiagnosed mental issue.