It's great your sleep is ok. Being up all night worrying is really awful I am also someone who worries a huge amount ahead of time if something challenging is coming up. I think it's called "anticipatory anxiety". At any rate, usually, the thing turns out to be nowhere near as bad as the awfulness that I have conjured up in my mind....I'm sure it will be that way with your new job too. It's really exciting that you have found a job that is a good fit. Congratulations again! And I really hope it goes well!