Lawmakers brought pillows and blankets to the House as the Democratic protest stretched toward midnight.
Rep. Elizabeth Esty of Connecticut had a sleeping bag, while Sen. Elizabeth Warren of Massachusetts brought Dunkin' Donuts for her House colleagues who were staying awake.
Other lawmakers also brought snacks, including some who broke House rules to eat on the House floor.
Rep. Emmanuel Cleaver II of Missouri, dressed in a pink suit, carried a pink-and-white striped pillow in his hand for several hours as he walked around the House chamber.
Cleaver, a Methodist minister, later was one of several peacemakers to break up a near-fight between a Republican and a Democratic lawmaker.
Republican Rep. Louie Gohmert of Texas approached the Democrats and yelled, "Radical Islam!" Democratic Rep. Corrine Brown of Florida started yelling back at him. The two came within inches of each other, both yelling.
Lawmakers from both parties separated the two.
The Democrats halted the day's legislative session with their sit-in and protest. Republicans have struggled to force the House back into session.