About 7 hours is sufficient for me, but going back to sleep for another 2-3 hours after that is simply divine. When I can do that on the weekend, it's the best rest I get all week. When I took a trip to Japan after high school, my host father told me about how that "second sleep" is the most restful and that most people around there wake up with the sun and then fall back asleep for another couple of hours. I don't know what it is about that, but ever since I started setting on alarm for 5am (to go to the bathroom) and then another for 7am, waking up hasn't seemed so bad. As long as I'm in bed by midnight, the 5 hours--> go pee --> 2 hours schedule works like a charm. Of course, three out of four nights I just stay up too late and skip setting the early alarm to avoid disrupting my sleep cycle too much.
...I should really make myself get to bed on time. :P
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