I think you could use midnight-midnight as your cutoff, but I keep pretty erratic hours myself (being a student and all - studying (cough) late and sleeping late the next day) and usually go from when I wake up until when I go back to bed, even if I wake up at 11am and go to bed at 3am the next morning. That might make it a little less complicated for you, especially if you don't work the night shift every night. Good luck!
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