I usually try to get 8 to ten hours of sleep during school days, but after a bit of IW/reading I usually find out I've got less than that

During weekends it's usually something like one a.m. till eleven, but sometimes I go to bed at three or wake up at one. It really differs from day to day, but I find myself becoming more and more of a nighttime person. You're not alone
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The last arrow of Legolas kindled in the air as it flew,
and plunged burning into the heart of a great wolf-chieftain.
All the others fled. -J.R.R. Tolkien, The Lord of the Rings