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They would go to bed earlier, sleep longer, sometimes even sleep in 2 distinct chunks as opposed to one block.
Sleep Info
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Interesting article. I kept a schedule similar to this in college. I basically slept from 4-7pm and 4-7am and I felt great most of the time. Any disturbance in my afternoon "nap" really messed me up though. But I was able to drink, work, and go to class and still feel well rested.