Rose knew she had been up for a while but she found out during the time working on the vortex manipulator that she didn't need as much as she use to. Don't get her wrong, she will still sleep like the dead. Just not as often as she used to. She wonders if that was also a change looking into the heart of the TARDIS had done. She wouldn't know until later and besides she knew the Doctor needed her now. She wasn't about to fail him when he desperately needed the help.