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How do you sustain motivation when working on personal projects?
Working 8 hours a day on programming stuff I find that by the time I get home, or even on my days off, I don't really have the drive to do any more programming on personal projects, be it for research/experimentation, or even legitimate things I would like to create and release.
How do you manage, or have you managed, to do these projects in addition to working a full-time job?
(Assume there are no issues of your employer being entitled to any IP you create on your own time.)