I think one thing I did sometimes would precede the 'no sleep Mac' thing. I'd have an external monitor connected, then disconnect it. Looking back, I did noti

I think one thing I did sometimes would precede the 'no sleep Mac' thing. I'd have an external monitor connected, then disconnect it. Looking back, I did notice that often disconnecting a monitor would mean... it might take 20+ seconds for the OS to be 'normal' again. If I waited for a minute after removing a monitor, the sleep would seem to work. Disconnecting at office and putting in the bag... it never really went back to 'one screen' mode, and I presume continued to think an external monitor was connected. I can't say that's behind all the events, but thinking back on it more, I know that was a repeating scenario.