Starting a business is not the solution, since all of the problems you describe apply equally well to a lot of founders, and especially founders without funding

Starting a business is not the solution, since all of the problems you describe apply equally well to a lot of founders, and especially founders without funding for whom you can add "poor" and "lonely" to the list of adjectives you use to describe your own insane lifestyle. Would you be happy working for yourself, but stuck at home all the time? So fix the problem... scale yourself back to eight hours a day. Make it a point to leave the office by 6:30. After a month of this shift this up to normal closing time. There is no need to ask permission: if someone asks say you have something in the evenings after work. If this is a problem waltz into a more reasonable position. That said, one practical suggestion is that if you're changing your work hours, you need to get into the office at or before 9:00am, since it is common for managers to perceive staff as coming in late, but very rare for them to recognize the sheer amount of time put in working late. You also don't want to spend a lot of time at the office talking about your new evening activities while you're getting people conditioned to your working non-insane hours. You want the only noticeable shift in your behavior to be the fact you leave at a reasonable hour. After a month or two you won't need to worry about this, but if you give into the temptation it might be perceived as flaunting authority.