Doctors diagnosed Senate Majority Leader Harry Reid (D-Nev.) as exhausted on Friday.
Reid visited George Washington University Hospital but was later released and, according to a statement from his office, the trip was simply a "precaution."
Last month, frustrated by Republican obstruction, Reid deployed a procedure changing Senate rules so that most nominees could be confirmed by a simple majority vote.
As The Washington Post pointed out late week, Republicans retaliated and have recently "declined to yield back hours of time set aside for each nominee, as historically has been the practice. The decision forced Reid to call votes at odd hours on Thursday — 1 a.m., 9 a.m., 7:30 p.m., 9:30 p.m. — and the 7 a.m. Friday vote."
Spokesman Adam Jentleson stated that Reid "spent today resting, talking to family, friends and colleagues, reading the news and discussing Senate business."
According to a recent Gallup report, 40% of Americans don't get the recommended amount of sleep at night.