There is a decent Netflix show that discussed how America’s war efforts and their fear that they could diminish their control over the people in effect put back research in the area back half a century.
During my maths degree I would often try to solve problems last thing at night. If I could not solve a problem. I’d Go to sleep. I would have no recollection of solving the problem but in the morning I would often be able to immediately solve the problem.
This could have been down to a fresh brain but the speed at which I would solve the problem in the morning and pretty much just know the solution I’m convinced I was solving the problem in my sleep and then basically just writing it down when I woke.