Which documentary did you see?
I was channel surfing this past Sunday evening & by chance I stumbled upon one of these “Bonus Channels” they offer and in the History section was this documentary on Alexander. I thought I’d give it a try. I never fell asleep until it ended.
I found it on youtube just now.
https://www.youtube.com/watch?v=-yq0QzlyyCs&t=24s
I inadvertently omitted in my prior comment that I was channel surfing what our DISH had on the schedule that Sunday evening.
If I lay in bed in the evening & watch TV and the program keeps me awake then it had to be good imho.