Life swings me between both. Depending on my projects, real-life and regular work I have to force myself to adjust every 3 months or so. I am used to it now. I can sleep any time and wake up whenever I want. That is how I have trained myself. It is not a good thing and I need to normalise my sleep cycle.
Well this one hits me just right haha - exactly what I do. Generally it's bed at around 1-2am and up for work at 7am. Not sure how I'm surviving on about five hours sleep but it works just fine for me!
I get that too. I got used to go for jogging every day. So if I stay late, that is going to affect me. And I feel sleepy at work. I am something like we see in the movie divergent. Almost everything works for me. I can live with almost every kind of habits, only until I get irritated by the side effects.