Interesting article. Hits home for me. I've honestly struggled with this for years. I've always been a night owl.
As a young adult, I managed to get away with it; my family and friends would often called me "lazy" or a "late sleeper" but I always pointed out that, although I woke up at 11, I went to bed at 4, so it's not like I'm sleep for 12 hours at a time.
However, as an adult, it's challenging; I have to get up early for work or school, but I crave the late-night dives into my thoughts.
Also, it's not that I necessarily like being alone—I wouldn't call myself a solitary person—but I find that the night is also productive and fertile time because there are fewer distractions: once everyone's asleep I can work undisturbed; for me there's something calming about the night/early morning.