weekend jetlag
The insatiable desire to go to sleep come Sunday night made impossible by the fact that it was past noon when you woke up. The jetlag continues Monday morning when you are sluggish, unproductive, and not likely to recover until you hit your bed at 8 PM that night.
"Wow, man you look terrible. Were you up drinking on a Sunday night?"
"Nah, dude. I just got some serious weekend jetlag."
"Nah, dude. I just got some serious weekend jetlag."