Sen. Joe Manchin, D-W.Va., walks away from the Senate chamber at the Capitol in Washington, Tuesday, Jan. 21, 2020. President Donald Trump’s impeachment trial quickly burst into a partisan fight Tuesday as proceedings began unfolding at the Capitol. (AP Photo/Cliff Owen)

Sen. Joe Manchin, D-W.Va., walks away from the Senate chamber at the Capitol in Washington, Tuesday, Jan. 21, 2020. President Donald Trump’s impeachment trial quickly burst into a partisan fight Tuesday as proceedings began unfolding at the Capitol. (AP Photo/Cliff Owen)

WASHINGTON (AP) — Adam Schiff was still speaking — about witnesses, documents, future presidents and the impeachment of President Donald Trump. He’d said it all before, but five hours into the Senate trial, Schiff, the lead prosecutor, was saying it again.

Suddenly, from the Republican side, Sen. James Risch of Idaho raised his left hand so Schiff could see it and pointed, repeatedly, to his wristwatch. Time’s up, Risch signaled. He was right: It was time to vote, and — perhaps as important — it would soon be time for dinner. Schiff yielded, and the senators rose to vote and then quietly left the chamber.

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“The subject matter is something we’ve all heard,” Sen. Mike Braun, R-Ind., told reporters.

The understatement helps explain what seemed to be a widespread struggle with attention late Tuesday and early Wednesday as arguments in the abuse and obstruction trial stretched past midnight. It’s a challenge anyone who’s served on a jury might understand, but senators try not to complain, given the enormous political stakes of the trial during the 2020 election year.

About a third of the senators are up for reelection. The more senior members are on camera during the proceedings. Anyone falling asleep — and a few senators looked like they might have Tuesday and Wednesday — during only the third impeachment trial in history would have some explaining to do.

The urge to nod off stems in part from the familiarity of the arguments. They have all heard the story of Trump’s pressure on Ukraine. Only a handful claim to have not made up their minds on whether Trump should be removed from office. And the outcome — the impeached president’s acquittal — seems clear. Still, the trial is expected to cover tedious, familiar territory six days a week until it is resolved.

One piece of good news for the attention-challenged: The Senate voted Tuesday to trade 12-hour days for 8-hour days when opening arguments begin. And both sides are using audiovisual aides to keep people awake. Lawyer Jay Sekulow did a bit of pointing and raising his voice at one point late in the proceedings, which seemed to perk people up.

But inside the crowded, tradition-bound chamber, senators have little to do besides take notes and listen. Phones and coffee are banned. So are talking and passing notes to each other. There’s no pacing around the chamber. Snacks are traditionally frowned upon, though Sen. Ben Sasse, R-Neb., could be seen popping something into his mouth and chewing as he wrote on a notepad.

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Senators in both parties paid close attention and took notes, highlighted papers and listened intently — at least at first.

One of the most prolific note-takers throughout the proceedings was Maine Sen. Susan Collins, a centrist in a tough reelection fight this year. Sen. Elizabeth Warren, one of four Democratic presidential candidates forced back to the Senate ahead of the Iowa caucuses, held both a blue pen and yellow pencil in her right hand and alternated which she used to take notes.

Others appeared to struggle to maintain attention as the hours wore on. Sen. Bernie Sanders, a presidential hopeful who has openly complained about having to be in Washington, yawned and at one point tipped his head back on his chair.

Minnesota Sen. Amy Klobuchar, another Democratic presidential candidate, appeared to be subtly chewing something at length, possibly gum, as Schiff spoke.

It’s worth noting that he did so largely extemporaneously virtually all day, referring sporadically to a page or two of scribbled points laid on the podium at the center aisle. The repetition on calling witnesses and documents, he said, was purposeful: Getting to what Democrats consider a “fair trial” is hard. But the statement may have applied to the tedium, as well.

“It’s not our job to make it easier for you,” Schiff said.

A few hours in, the visitors’ galleries were less than half full. A staff area of the Senate floor had extra chairs but few people sitting there. Senators periodically gazed up into the galleries, a rare occurrence.

As the debate stretched past 1 a.m., senators became looser with the rules. Several senators stood at their desks, walked around the back of the chamber or chatted quietly among themselves as Democrats continued to offer amendments. Some members sat with their eyes closed.

Full Coverage: Trump impeachment

Then something happened that jolted everyone awake: White House Counsel Pat Cippolone and Judiciary Committee Chairman and prosecutor Jerrold Nadler clashed openly on the floor in a manner that prompted Chief Justice John Roberts to set some boundaries.

“I think it is appropriate at this point for me to admonish both the House managers and the president’s counsel in equal terms to remember that they are addressing the world’s greatest deliberative body,” he said. No matter the hour, he suggested, “Those addressing the Senate should remember where they are.”

Through the final vote, senators started pacing around. Several leaned against back walls. At one point, Sanders was sitting in the staff area. Klobuchar and Warren stood together and chatted through the whole tally.

Sen. Martin Heinrich had disappeared for a time. After about 10 minutes, he appeared to slow claps, laughing and “woo hoos.” He voted and at 1:50 a.m., Roberts adjorned.

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Associated Press Writers Mary Clare Jalonick and Alan Fram contributed to this report.

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Follow Kellman on Twitter at http://www.Twitter.com/APLaurieKellman