Did almost 35 years of:
Afternoon (1400 - 2200)
Swing (1230 - 1900)
Morning (0730 - 1230) followed by Night (2200 - 0730)
Sleep
Off
Off
As time went by I found it was taking more and more time to recover from the night until it reached the state where I could sleep through most of the Afternoon duty
This sysetm was a legacy from WWII. Not really suitable to today's traffic patterns and thankfully disappearing now.