He is clearly suffering from exhaustion.
The job is incredibly demanding, and he is getting little sleep. He may enjoy all these trips to Mar-a-Lago, but the travel also takes a toll - and the golf. And the 'effin TWEETS in the middle of the night!
He would be better off with a healthy diet and a few hours of quality sleep. If he doesn't capitulate and change his lifestyle somewhat, to adapt to the demands of the job, he will only get worse.
If he does have some decline, certainly his lifestyle and the job will hasten it, and the speed will be exponential as the exhaustion accumulates.
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