There is some suggestion that Hitler was homosexual, clearly the early Nazi party was full of homosexuals. And there is little doubt that Hitler had an exploitive sexual relationship with his niece who probably killed herself out of revulsion.
By the time of his death, Hitler was clearly deranged and it just was not from inherent insanity, although that can be presumed, for is clear that no one could consume the amount of barbiturates and other mind altering drugs that he is now known to have taken and remain sane. His interference with the generals' conduct of the war, which accelerated toward the end, can be ascribed to his drug addicted, mind addled, condition.
The material in this article appears to be supplementary as well as confirmatory of the BBC presentation.
Detailed treatment of the subject:
So his insanity went to the next level and pretty much stayed there.
In fact they speculated that Hitler's private doctor was either completely incompetent, or was actively trying to kill him.