A long short week

Good Friday and this Monday were holidays in the U.K., so this week is a short week.Holiday
But like a few other people, I feel like this has been “a long short week” (it happened before as well).
I can think of a few reasons below:
1) Expectation: We expected a short week and that put us in a different mind-set.
2) Contrast: Our body and mind probably adopted to the holiday mode during the long weekend and it might be a shock to the system returning back to work (despite the short week).
3) Residual impact: Some might be doing too much (traveling, partying and the like) during the holiday and thus started the week a bit tired.