Its not ideal, so I dont recommend it to anyone. It just so happens I am super tired after work, so I need to give my brain a rest. But because I’m sleeping so early (like 7pm - 9pm), I inevitably wake up during the late evening. Then i try not to waste the remainder of the evening and end up staying up late for math and programming. Programming is easy to stay up, math is hard to do consistently.

Then I sleep 3.30am or so to 8.30am, am cranky for the whole morning, but that is okay since I can do my work in autopilot most of the time.

The end result is I am definitely getting a solid few hours each day for my studies, whilst maintaining a job.

It was actually quite common in the 1800s to wake up and do a bit of work in the middle of the night.

Thanks. I was just curious because I don't seem to have the mental focus at night for such endeavors, but that is the only time I have for such things.

I struggle a lot without that small nap. Would recommend trying that, alternatively maybe wake up early and spend the first hour on your chosen personal field before work. That way, you can be happy the rest of the day, knowing you accomplished the most important thing for you (your personal endeavours), and spend the day at work more relaxingly :)