But at the state level this year, bills have been introduced in Maryland and Massachusetts and will be introduced in Minnesota on Monday, each of them calling on employers to give workers at least 11 hours between shifts and three weeks’ advance notice for schedules. Those proposals would require businesses to pay some time and a half whenever employees are called in before 11 hours have passed between shifts.

Paul Thissen, the Democratic leader of the Minnesota House of Representatives, supports the legislation. “When it comes to scheduling, the playing field is tilted very dramatically in favor of the employer,” Mr. Thissen said. “What we’re proposing is just trying to rebalance the playing field.”

Anthony Newby, executive director at Neighborhoods Organizing for Change, a Minneapolis-based group that advocates for worker rights, among other issues, said that clopenings have become a big issue in his region. “Clopenings are hurting many of our members; many are in the restaurant field and some in construction and nursing,” he said. “We worry it has an effect on safety — workers feel they’re on autopilot. It also has a big impact on families, on mothers trying to manage a family and arrange child care.”

Ms. Brown, who works as a cashier at Taco Bell, said her children — ages 5, 4 and 2 — don’t like it when she has just seven hours between shifts. That usually means they hardly see her for two nights in a row; they sleep at their grandmother’s both nights. On the second night, after just three and a half hours’ sleep the previous day, Ms. Brown says she stops by her mother’s for an hour or two to see her children, and then heads home to sleep.

“My kids say, ‘Mommy, I miss you,’ ” she said. “I get so tired it’s hard to function. I feel so exhausted. I don’t want my kids suffering not seeing me. I try to push to go see them.”

Although Ms. Brown dislikes clopenings, she doesn’t turn them down because she needs as many hours as she can get. She makes $8.10 an hour and works about 25 hours a week.