There is probably some low-hanging fruit I was ignoring till now.

For example, at my job I have flexible working hours... when I read the rules carefully, they say that each day I have to work between 5 1/2 and 10 1/2 hours, together 40 hours every week. Now that I think about it, perhaps I could split the week in two long days, 10 1/2 hours each, and three short days, 6 1/3 hours each. During the long days I would simply come home from the work, watch some movie and go to sleep. During the short days, I would be home soon enough to take the nap and then have a long free afternoon.

Not sure until I try (I guess the next week is as good as any other), but it feels like it would be an improvement to the regular schedule of 8 hours, where it's kinda late to take a nap when I get home, and I feel tired and out of time to do anything meaningful. -- I just need to prepare a specific schedule and commit to following it.