The last 8 years I have had to be at work at 3 am, the previous 25+ years I had to be at work at 11 pm, so does that make me a morning or night person?
Way back in the 1970's, before I entered the working world, I frequently was up until 2 am and in bed until noon.
We were in bed by 830 pm Saturday night, and up at 530 am Sunday morning. Got a ton of stuff done Sunday because of it.