The U.S. Senate kept the lights on overnight to confirm a federal judge and one of President Obama's picks to serve on the Equal Employment Opportunity Commission as Republicans continue objecting to rules changes made in recent weeks by Democrats.

The decision to keep the Senate open overnight forced several senators to stay up late, or wake up early, to serve as the presiding officer. By tradition, the majority party taps its most junior members to lead the proceedings, usually for about an hour at a time, in order to learn the chamber's arcane procedural rules and tricks. That was the case overnight and early this morning, as eight senators in their first terms took turns leading proceedings.

Here's the schedule of senators who presided, as provided by the Senate Democratic Cloakroom: