[rue]

Gonna second this. Do something fun, whatever it is. You don’t need to be a hero the first day. Go in well-rested, motivated, and open-minded.

The company pays you to learn their stuff.

[zlnimda]

Moreover, they need you to learn how it works in your future team. And for that you need to work there.

So, that's simple : - First, rest right now ! - Second, when you'll be there, work hard !