A while back, around 2006 or so, I used to work a day job at the same time every day, then play at night until about 4 AM. When I got an Xbox 360, I decided I wanted a better username than the really bad weeaboo name I was using. So I went with ItStartsAtDusK, because I played almost exclusively at night. That got shortened to DusK when I started playing Halo PC again, and then I started using that for everything.