[noodleman]

>At work, there's a box on an HR form where employees can choose between: disabled, not disabled, or prefer not to say

I've always assumed these things were just for statistics. I doubt much will change just from changing your answer.

That said, in the places I've worked (disclaimer: not US) it seems the vast majority of people are not just accepting of autism but are actively aware of how it affects people and are prepared to make adjustments to accommodate.

It wouldn't even be brought up in an interview in my current team, unless you wanted to discuss it. It wouldn't be held against you at all.

I think it might surprise you if you communicate the problems you're having. If someone in my team felt like their work environment was causing them to need to pull all nighters then we'd try to address it.