Oh god this is so familiar. Work from home, too, pays the bills just fine but I've lost any semblance of schedule. Barely need to go out anymore, just for groceries but my gf who goes out daily and loves to cook likes to do this part, only occasionally do I run to the store to get some things for her. So I barely get out.
Been meaning to go out on a daily basis but I think I have DSPD [0] and so I tend to wake up late, sleep really late (or early in the morning). It's terrible really, I feel like a bum or a teenage kid sleeping like this but it's like I'm programmed to act like a 3 year old in the morning, the self-discipline required to get out is insane while I've generally always had a bit of a spartan lifestyle haha. It boggles my mind how hard it is for me to get up. And I absolutely can't sleep at night consistently. Even if I wake up at 8AM, work out heavy for 2 hours, spend a day draining my brain concentrating for hours, meet people for hours and go around town doing groceries and am physically tired, I can't sleep. And then at 4-5AM it hits me like a train. Sometimes I'll power through, not sleeping because I know if I sleep at 4, I'll wake up at 12. So instead I'll try not to sleep and power through until the evening, and then yes I can finally sleep at night that day.
But then that next day I generally still wake up at 12. Even if I ease into it and change my sleeping schedule by 1 hour every two days, at some point it gets reset. Anyway the point of all this is that I tend to wake up shortly after noon and I just don't want to go out for an hour at that point, all I want to do is get some work done before I need to clean up, help prepare dinner, spend time with my gf etc. After sleeping in so late, the last thing I want to do is spend the first hour walking around outside. So I postpone going outside to the evening and I never really do, especially if it's dark and cold like now. In that way it's exactly like you said, a self-imposed prison in the name of work and saving time. And then a little later it's 12PM and I've still got hours ahead of me, but there's no way I'm going outside at 3AM. (I used to as a teenager, but now as an adult I'd just feel like a freak and my gf would get super worried and want to have 'a talk' if I started doing that haha. Also I'd be bored out of my mind if it's dark and deserted. Also, no Vitamin D at night!) Writing all of this down is confronting haha, looks like my life is a mess.
Still trying to find some balance to all of this. I've been meaning to just get a regular job again, but I'm genuinely afraid I couldn't do the 9-5 schedule, as I basically went straight into freelance work out of college and both college and freelance work allowed weird schedules. The hope is that the pressure to conform to this model for fear of getting fired etc forces me to keep to the schedule.
Would love any more ideas or experiences if you want to share :)
0] http://en.wikipedia.org/wiki/Delayed_sleep_phase_disorder