The key to not having to deal with this problem anymore, for me, was starting to proactively switch things around to break the routine of consecutive work-weeks. One of my tricks was to do some kind of mini-vacation every 6-8 weeks, go somewhere new, leave work behind for 3-4 days. Even smaller things like regular social events can work wonders – anything that breaks the weekly routine.

Source: Ask HN: Why can’t I learn anymore? | Hacker News