My new co-worker, a Jr. developer who started 2 weeks ago told me; "I am starting to see in my dreams the solutions of my tasks."

"Welcome to the club.", I said. :P

I have woken up to have perfect solutions to bugs I had the previous day, which I deemed very hard to fix at the time.

I once woke up, 3am in the morning, and finally figured out what exactly the dot product does. Many people tried to explain it to me and I also read all wiki pages and stuff I could find on the webs, but nothing helped me as much as a tired state of mind early in the "morning"