Ask HN: What's a good low profile job where I can hack at the same time?

It sounds neat, but don't underestimate the long-term dangers of sleep-deprivation. You really would need to sleep during the day. Before trying something like this, spend some time at home during work hours to make sure that you haven't been missing out on annoying neighbours and noises while you're away.

I lived in a condo once, next to a construction site. The noise started at 8 am and finished at 4pm. I ran into a woman in the elevator, crying because she couldn't sleep and she worked a night shift.

I suspect he just means that one projectionist runs all the movies in the house. So, a lot of walking around, and not a lot of just sitting beside one projector. A friend of mine from high school wound up in this job, and it sounded pretty awful when he was describing it to me. He seems to enjoy it, though, and apparently does get to watch most of the movies eventually (but, then again, his is a smallish theatre with only a handful of screens).

Since my friend dropped out of college, and his prior experience was working in a toy store and a couple of video rental stores, I would think anyone with a pulse could obtain such a job (he's pretty charming, though, so maybe he did have to interview well to end up running the machines rather than running the register at the concession or cleaning the aisles).

When I was in college I worked the night shift at a television station in the tape room, and spent most of my time, four to five hours each eight hour shift, learning UNIX system administration, shell and Perl programming, or writing songs. However, last I heard, stations had started automating away most tape duties and merging the master control and tape operator jobs into one. Master control is not a "lot of downtime" kind of job--there are interruptions every few minutes, though I imagine it's seen some automation improvement since then.

System administration positions often have a lot of downtime, since if you're doing your job well, nothing is urgent and everything just hums along real pretty-like. Night watch in a hosting data center would probably be a great choice. If you're still in school, night shift in a university tech center would probably be a good choice, too (assuming it's open 24 hours...I think most large universities do have at least one center that is open all night).

Finally, have you considered contract work? This is a different model altogether. Instead of taking a job where you can half-ass it, and work on what you really want to most of the time, you take jobs every few weeks where you work your ass off, get paid a metric ass ton (like $100-$150 per hour), and finish the project in a week or two. Then you're free to hack for pleasure for a few weeks before taking on another paying gig. This has mostly been what I've done since leaving college and the television station. I usually billed $1000/day plus all expenses, if travel or whatever was involved, and often made more than my friends who worked full-time at regular jobs...it only takes a few projects for that math to work out.

Yes, that's what I mean.

In this case, though, you need to be careful if you decide that you want to turn around and sell your 'hacking' as a product. Because you used company resources (at-work time and equipment) to produce it, there is a strong legal precedent allowing your employer to claim ownership of your creation.

I'm in the position of working full-time and starting a company part-time, and am very careful to keep my two worlds separate, even though I'm 99.999% sure that my employer has no interest in attempting to take ownership the product I'm building.