The reality is probably that he has a lot of creative energy inside but by the time the kids, who are probably 3 and 5, are in bed and he's eaten his dinner and spent time with his SO, it's 8pm and he's shattered, but somehow, he's managing to pull what little energy is left and put it into his project.
Too real, depends on the kids thou. Mine don’t want to sleep and by the time they fall asleep I have been already fallen asleep, woken up a few to accompany them to the bathroom or to fetch some snack as they are suddenly ravenously hungry…
I guess there is not enough time to spend with my SO, or even less time for side projects at this time..