It was Representative Blake Moore’s turn to vote, and the Utah Republican was asleep.

By the time the clerk called Mr. Moore’s name, at around 5 a.m. on Wednesday, the tax-writing House Ways and Means Committee, which is drafting the tax portion of what President Trump calls the “big, beautiful bill,” had been meeting for some 14 hours. The vote was on one of several amendments that Democrats were trying to make to the proposal.

When the clerk was met with silence, he tried again. “Mr. Moore?” Attention — and a C-SPAN camera — shifted toward the congressman’s chair, where he could be seen slumped forward, head listing toward one side. A colleague eventually jostled him awake, and he voted no.

Politicians generally try to keep their snoozing out of public view in the Capitol complex, where many are known to sleep in their offices or retreat to hideaways for private moments of rest.

But as Republicans rush this week to speed along a mega-bill to enact Mr. Trump’s domestic agenda, two committees overseeing some of the most contentious proposals held marathon meetings that turned into all-night affairs.

In another office building just down Capitol Hill, a camera caught Representative Debbie Dingell, Democrat of Michigan, with her eyes closed and her head tipped back as the House Energy and Commerce Committee debated Medicaid cuts during a 26-hour-plus meeting.

Ms. Dingell later suggested archly that she was just resting her eyes.

“Been up for 31 hours straight fighting Republicans trying to gut Medicaid,” she wrote in a reply on X to the video. “Closed my eyes to think about an America where everyone has access to quality, affordable health care.”

Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.

Thank you for your patience while we verify access.

Already a subscriber? Log in.

Want all of The Times? Subscribe.