Maybe the stress is causing him to lose sleep. Sleep deprivation can do awful things to the mind. If it is as bad as some of these reports suggest, perhaps he will resign. A long shot, as I don't think he will surrender the presidency that easily. I think he will hang on under the not-too-irrational perception that he is in a better position to protect himself from legal jeopardy as president than he would be as a private citizen.
Below is a link to an article on one source of such possible stress which also helps explains his need to stay in office to use the power of the presidency to protect himself.
Mueller's breadcrumbs suggest he has the goods
(Alternet) Everyone's waiting for the "Mueller Report." But it turns out that special counsel Robert Mueller is writing a "report" in real time, before our eyes, through his cinematic indictments and plea agreements.
The big picture: One of the least-noticed elements of the special counsel's approach is that all along, he has been making his case bit by bit, in public, since his very first court filing. With his major court filings so far, Mueller has already written more than 290 pages of the "Mueller Report." And there are still lots of loose ends in those documents — breadcrumbs Mueller is apparently leaving for later.
Trump's main asset, if it can be called that, are the enablers who continue to support Trump, no matter what. An article that I linked in the Future of False Consciousness opens up an interesting line of speculation as to the psychological motivations of such supporters. That article is also linked below:
These enablers are making it harder for everybody else, with the possible exception of the top one percent who benefit from tax cuts, ill advised regulatory relief, etc.
Also in the Future of False Consciousness thread is a point that "Trump's habit of denying reality and spinning baseless conspiracy theories that fit his preferred vision of the world is a direct outgrowth of the GOP's denial of climate change science." The enablers are essentially egging Trump on to dig a hole that is deeper and deeper for himself as well as for the rest of the planet. Stupidity2.