[lusr]

What did you expect them to do? Go home and go to sleep and come back in the morning to check the logs? Come on. They'd hardly close their eyes for a second with all the excitement.

They're all there monitoring the various systems because they're all responsible for various components of an incredibly complex piece of equipment.

Assuming the landing goes well, they all still need to be there to continually monitor the operation of the systems they're responsible for and provide feedback if things don't like how they expected - it's not just about landing there.

This is normal even when releasing a tiny piece of software; it's hardly surprising NASA do the same for a multi-billion dollar project.