Both me and my dad are in night mode by default. I'm a programmer so I kind of have the luxury of kindly explaining people that my brain does not function before 10 AM, that I can kick it into functioning before 10 AM if it's really necessary and that they can go fuck themselves if they need it to function before 10 AM as a policy. My dad, however, was in the army, so he had no such luxury. He had to be in his office at 07:00 sharp.
He did manage to cope with this though; we never really talked about it, but I could tell he developed coping mechanisms, all of which are definitely learned.
For instance, he somehow managed (and still manages) to fall asleep when it's really needed. As in, if he knew he had guard duty (that was a 24-hour shift), he went to bed earlier the day before (around 8-9 PM). He'd be snoring within five minutes. Same if he had to stay awake -- if he had fifteen free minutes, he could sleep through them like a log.
He also religiously stuck to his waking routine. He woke at 05:45 even on weekends. He'd maybe make an exception during holidays or when he took some time off, but no more than once.
Studies show that learning exotic programming languages like Haskell, LISP/Scheme accelerates neckbeard & facial hair growth.