I devolve rapidly once my wife leaves. If she leaves in the afternoon, that night I'm already drinking beer on the couch in my boxers while eating beef jerky for dinner and watching the history channel for three straight hours.
I say "I'm gonna head to the gym in the morning and then maybe swing by Home Depot and pick up that _____ I need to finish that project in the ____."
Then, I stay up til 4 watching Netflix and playing video games, sleep in til the Cats play, and have beer and an omelet for brunch (<--do not do dishes but will quickly rinse omelet pan for re-use next morning).