On Thursday, the president has an especially light schedule: “Policy Time” at 11 A.M., then “Executive Time” at 12 P.M., then lunch for an hour, then more “Executive Time” from 1:30 P.M.

This is reportedly a shift from Trump’s schedule during the early days of his presidency, which “began earlier and ended later.” But Trump was unhappy with the long hours and pushed for a later start to his day. When asked for comment, White House Press Secretary Sarah Huckabee Sanders told Axios that “the time in the morning is a mix of residence time and Oval Office time, but he always has calls with staff, Hill members, Cabinet members and foreign leaders during this time . . . The President is one of the hardest workers I’ve ever seen and puts in long hours and long days nearly every day of the week all year long.”

News of the president’s scant hours comes as the White House faces a new barrage of questions about Trump’s mental acuity—questions inspired by anecdotes in Michael Wolff’s Fire and Fury, and stoked by the president’s own recent actions. (Though some have questioned the book’s accuracy, Wolff has repeatedly defended his reporting.) According to Wolff, “100 percent of the people around [Trump]—senior advisers, family members, every single one of them—questions his intelligence and fitness for office.” In a remarkable trio of tweets over the weekend, the president pushed back on these reports, assuring his followers that he is, in fact, “a very stable genius.” But with the White House dodging the question and Trump’s upcoming physical exam unlikely to provide answers, his daily activities may be the only window the American public has into what’s going on inside his head.

Yale University psychiatry professor Dr. Bandy X. Lee informed lawmakers last month that she had drawn certain conclusions based on Trump’s patterns of behavior. “We feel that the rush of tweeting is an indication of his falling apart under stress,” she reportedly told the group, which consisted of several Democrats and one Republican. “Trump is going to get worse and will become uncontainable with the pressures of the presidency.”