7-12 hours of poor sleep, my hours are way off - sleep around 3-5am, wake up any time between 11am-4pm. It's this way because my schedule allows for it and my friends like to stay out late, but I should adjust my hours because it feels pretty disgusting waking up regularly at 3 in the afternoon. My plan for the new year is to slowly adjust my schedule so that I crash at around 11pm and wake up at around 9am. I've been told humans' optimal sleeping hours are between 10 and 12, and that any sleep we get beyond something like nine or ten hours is worthless. I don't know how legit that theory is, but it doesn't hurt to try it out.