Congrats on the job offer. You are correct, when working, you have to comply with the working hours. When I was working, I had to get up at 4am to get to work on time. It was hard; I had to go to bed at 8pm in order to get my 8 hours in. I discussed the situation with my pdoc and, as I am bipolar, he placed me on a low dosage of seroquel as a sleep aide. I managed to keep the proper sleep hours for the last 10 years of my career.

Talk to your proc or your MD about your concerns. They may be able to help. Good luck! I'm pulling for you.