It would suffice to say aging sucks. But when I stay up late, still get enough sleep, and feel much the zombie in the morning, I can't help but think it has more to do with how much of my youth was spent with next to no sleep.
So much of my younger days, sleep time fell somewhere between 0400 - 0700 with wake times usually 0900 - 1000. Because in my family if you wanted any peace or needed concentration that meant waiting for everyone else to be asleep. Ironically back then I didn't consume caffeine either, lol.
Last night was more like 0045 - 0915, or about eight hours of glorious sleep. Pardon me whilst I drain coffee like crazy.