What if DT had a false friend who messed with his head which caused him to make dumb tweets?
What if someone in DT's inner circle had been a false friend who messed with his head a little somehow? What if they gave him coffee sometimes, but sometimes coffee with just a little extra caffeine or amphetamine so he couldn't control his tweets?
Less than the amount required to give you a buzz, obviously, so he wouldn't notice.
Something seems to have kept him up at night. He seemed to be running on a preplanned platform but not responding to or answering his critics in the media very effectively.
Look at the Capitol riot. He simply failed to respond for several hours. It's easy to speculate that someone in charge of the Capitol police allowed the riot to happen. If so, they could have coordinated their efforts with someone in DT's inner circle who made sure he was a wreck that day so he wouldn't have a coherent response ready.