A hypothetical person who manages his or her private income and expenditure strictly in accordance with rational self-interest, with no regard to the welfare of others; = economic man n. at economic n. and adj. Special uses.
“Homo economicus, n.” OED Online. Oxford University Press, September 2016. Web. 12 September 2016.
Normally I have the energy to say something about how my weekend has been, but right now I just want to curl up in bed and restart the day.