Ask HN: How to time-shift my productive hours

I work for myself, but due to circumstances, I'm quite limited in the hours I can do - I drop my wife off at work in the morning and usually have to pick my child up from school in the afternoon. So it's 8:30-9am to 4-4:30pm for me most days (with a bit extra in the evenings).

For a while I've not felt like I'm getting much done. And now that it is the school holidays (so I don't have to drop the wife off or pick the child up) I think I've figured out why. You see, this year I've had an office, rather than working from home. So, during the holidays, I can get up when I feel like it, get the bus into town and work till I'm done.

And I've found that I am significantly more productive when I'm coding between 2pm and 6pm. I'd say I get five times as much done as I would in an equivalent four hours in the morning.

So with school about to restart, and my old routine about to kick in, I'm wondering if there's any way I can shift that "hyper-productivity" timespan so to the morning. Does anyone have any ideas?