It's true for me but I'm self employed and work on my own projects.. I know quite a few regularly employed people I'd pin this on too, though.
I'd argue that it's due to the structure of work life versus home life. At (office) work, you typically have set hours and a certain set of activities to perform - the reality vs expectations gap is quite small.
In your "free" time, however, you expect to have a good time, yet usually have to wash clothes and dishes, cook food, go grocery shopping, and 101 other dull activities that merely wrap around the occasional fun things like watching a movie, going out, having sex, whatever. The reality vs expectation gap in your free time is gigantic for many people.
I'd argue that it's due to the structure of work life versus home life. At (office) work, you typically have set hours and a certain set of activities to perform - the reality vs expectations gap is quite small.
In your "free" time, however, you expect to have a good time, yet usually have to wash clothes and dishes, cook food, go grocery shopping, and 101 other dull activities that merely wrap around the occasional fun things like watching a movie, going out, having sex, whatever. The reality vs expectation gap in your free time is gigantic for many people.