[saiya-jin]

Same for me with learning new language (french) after long day at work... theoretically it should be fine and I know I should do it, but often the motivation is not there anymore at the end of the day, and you need some semi-constant momentum to get anywhere in these sustained efforts.

And once you get kids, they are more effective than black holes with sucking out any time you could have for yourself. Its well spent time, don't get me wrong, most probably the best way to spend it for a parent, but personal efforts suffer correspondingly. And next day is not gonna be different. Same for weekends and holidays. All year, every year.