Since he's known to shun alcohol, maybe he just fell asleep mid-tweet.
Many people think he is either illiterate, dyslexic, or lazy - how about all three? I do agree with your form-of-dyslexia theory. It fits right in with a 
newsweek.com article I just read.
"Almost every day at about 10:30 a.m., President Donald Trump sits with the heads of the intelligence community and a fresh Diet Coke to discuss some of the world's most highly classified information in the Oval Office. He prefers "killer graphics," like pictures, videos and charts, and often interrupts the meeting with questions and unrelated asides, according to CIA Director Mike Pompeo and National Intelligence Director Daniel Coats.
The president also favors tiny "nuggets" of intelligence that pop out at him during his daily briefings, and information that can be boiled down to a single page....."
Just think, the dangers of the entire world, from Syria to North Korea, "boiled down to a single page" with easy to read "pictures, circles and arrows."*
The man is trying to run a country using the telephone and Twitter.
I am troubled about his claim to never read books, except the ones he writes ... which, haha, we all know were written by ghostwriters working from tape recorders.
The man cannot spell simple words, even with spellcheck "Honor" becomes "honer"  "Unprecedented" became "unpresidented" ... a common failing of people with dyslexia. Everyone can easily distinguish between tweets written by Trump and those written by his staff.
When he goes off the Teleprompter and speaks off the cuff, he rambles along in incomplete sentences, jumping from one subject to the next, and always, always, brings the conversation back to himself ... no matter if he's speaking to the grieving families of our war dead.
 
You know, prior to this election, if a president I didn't like was elected, it didn't really matter all that much, because I trusted the system. I was never afraid that our new leader was going to drive the country over a cliff - I believed that "checks and balances" would always save us. If the President went too far in one direction, sensible heads and voices in Congress and the Supreme Court would correct our course.
All that changed with Trump. This man has made a shambles of our political system, and I worry every day that he will absolutely drive us over a cliff out of sheer stubborn ignorance and refusal to listen to anyone else, because he knows it all. The ugliest American of them all ... a greedy, narcissistic, un-patriotic grifter... absolutely the worst president we've ever had.
I would love to be able to hop into a time machine and read what future historians will say about this era.
* "Alice's Restaurant" popped into my head