I've had so many challenges with this, to the extent that at some point it began affecting my throughput at work. If I never switch "on" or "off", at some point

I've had so many challenges with this, to the extent that at some point it began affecting my throughput at work. If I never switch "on" or "off", at some point I run into a place where I feel like I'm always working but never getting anything done. I've also historically had issues maintaining a consistent schedule, and even viewed my unique position of not having to do that as somehow special – after a few years, I can tell you that it's not. Some colleagues I know enjoy working a few hours in the morning, skipping out around 2:30 PM and getting the rest done late in the evening. Eventually and very recently I came to the conclusion that this just doesn't work for me. My manager recently recommended I just work from 9-5 and sign off and shut my computer at the end of the day. It might seem obvious or painfully conventional, but it just works. No more colleagues complaining that I'm off the map half the time or hesitating to reach out because I might awkwardly be unavailable. I'm working less hours, shipping more, and enjoying my life when the work day ends.