“In a mostly blue state where Democrats control the Legislature, Mr. Christie, a Republican, won election last year mostly because of the deep unpopularity of his opponent, Gov. Jon S. Corzine. Mr. Christie, a former federal prosecutor known for aggression rather than deal-making, took office to predictions that his hard-charging style would not work in the labyrinth of Trenton, where factions of party, region and interest group would slow him down.

“Instead, he confronted the powerful public employees’ unions and won, cutting future pensions and benefits, and persuaded voters to defeat hundreds of local school budgets. He got nearly everything he wanted in the state budget, making the deepest cuts in generations. And the Assembly is expected this week to give final passage to one of his cherished goals: a cap on local property taxes. …”

“…Behind the scenes, it was even worse. The night before Obama announced the administration’s housing plan on Feb. 18 in Arizona, Sperling e-mailed the final documents at 3 a.m. and asked for comments. Five people responded immediately.

Martin Moore-Ede, a former Harvard University professor, calls it the “iron man” syndrome and says the American political workplace is one of the few that still resists a mechanism for ensuring people get rest.

One study conducted for the British Parliament found that “mental fatigue affects cognitive performance, leading to errors of judgement, microsleeps (lasting for seconds or minutes), mood swings and poor motivation.” The effect, it found, is equal to a blood alcohol level of .10 percent — above the legal limit to drive in the United States.

Obama administration officials, and their predecessors, shrug off such warnings, citing the adrenaline rush. They insist that their bodies have grown strangely accustomed to the rhythms of the job. But they acknowledge that the routine in the White House is more grueling than most had anticipated.

The staff is beginning to take a few breaks. One deputy press secretary found time to get away to Hawaii for a few days. Gibbs went to his high school reunion in Alabama, the first weekend away that he can remember.

But, he says, it is not enough.

“You go down to the mess. You have your coffee at five in the afternoon, and it just doesn’t do anything,” Gibbs lamented. “Because you realize you’re so far behind [in sleep] that a jolt — you don’t even feel it.”